In your first sentence
This comes with a lot of benefits.
They are friends with benefits.
using "with" expresses benefits which are additional and nice but not necessarily the primary reason for choosing something.
In your second sentence
This has a lot of benefits.
expresses a multitude of positive attributes and is often expressed as
This has many benefits.
Your third sentence
This offers a lot of benefits.
If you buy this SUV to carry the kids around, it offers the additional benefit of four wheel drive for better traction in bad weather.
suggests there is additional up-side to something which the receiver of the additional benefits may not have considered.
This is an interesting case I had cause to run into recently...
In some languages, there is no difference in translation between the English wait for and expect, and the idea of waiting for something without expect it is considered nonsense. Indeed, when I was working on something, it transpired that some dialects of English seem to consider them absolute synonyms, while in British English, in my experience, they are absolutely not absolute synonyms.
If you are waiting for something, there is no necessary sense that you are sure that it will happen, or that you will be displeased if it does not happen. If something is expected, however, there is a clear understanding that it is going to happen - or that if it does not happen, there will be consequences. It get more complicated if throw await into the mix...
If you are waiting for someone's reply, you are refraining from some sort of action until they reply, or just generally indicating that it would be good for them to reply. If they do not reply, it may inconvenience you, but you are not clearly suggesting that they are doing something wrong if they do not reply. Of course, there is an implicit suggestion that they should reply, and that they will have done something wrong if they inconvenience you, but the tone is not one of command.
If you expect their reply, then you are telling them that they should reply. It has a sense of command. There is an alternative nuance, which might be indicated by context or by the construction of the sentence, that simply indicates that you consider it a rational expectation that they will reply - that you are predicting that they will reply.
The tone also changes if you expect their reply by some time/date, potentially becoming a little less commanding but still with a definite sense of command. On the other hand if you are waiting until some time/date for their reply, it means that you will refrain from some sort of action (usually made clear in the text) until either they reply, or that time comes.
If you await their reply, there's a range of nuance, but I would say the usual one is that you are asking/hoping for them to reply, but no sense of command. It could even be positioning you as subservient to them, depending on context.
Examples:
... so I have to tell them something soon. I was hoping that you could give me some advice. I will wait for your reply.
You need to tell someone something, and you're waiting for this person to give you advice. You won't tell them anything until you get the reply.
I can't complete this transaction until you let me know the name of the payee. I am waiting for your reply.
You aren't commanding them, but you are indicating some impatience.
I want to get everyone's input before I publish the proposal, so I will wait until next Tuesday for your reply.
You're letting them know a time-frame for their response in order for you to take it into account. This is polite, neither commanding nor subservient.
If these matters are not resolved, I will have to take legal action. I expect your reply soon.
You are threatening to take them to court. It is commanding and confrontational.
In order to set the dates for meetings for the coming year, I need everyone to let me know their availability. I expect your replies by 15th April.
You are telling them that they need to give you the information, and telling them when to give it by. This is commanding, but not confrontational.
I would appreciate your feedback on my manuscript. Your opinion is very valuable to me, and I await your reply.
You are humbly asking for someone to do something. There is no expectation that they will do so, but you reinforce with the choice of words - await - the idea that you would be very glad to receive their feedback.
Best Answer
The perfect aspect (generally expressed with "to have" + past participle) implies that an action occurred at an earlier time than an action described without it. This applies to infinitive phrases, too. Thus, "to have been fired" implies that the action occurred earlier than an action described with "to be fired". Because the firing certainly did not occur before the expecting, I would avoid the perfect aspect and go with the first option: "Don't tell anyone about my first job--I never expected to be fired."