It seems Minamimoto's is the best solution. Last year I bought Rock Band 2 Special Edition (bundle with one guitar, one mic and one set of drums) for $99 on GameStop, but they don't seem to be making that deal at the moment (at least not online). On Amazon, it's $113. The Beatles instruments are prettier, so I think this set is worth the extra buck.
As for the other instruments, consider getting Lips. At $30, they come with 2 wireless microphones.
Harmonix is only selling one Rock Band 3 bundle, with the keyboard controller, so I guess you don't have much of a choice there. And it's sold out at Amazon, which is even worse.
As for the cymbals, both RB2 cymbals and the new Pro Cymbals are being sold by the same price, $40. The only issue is that the new Cymbals will only be released on October 30th. According to a review, the new cymbals are much superior, so it might be worth the wait.
The only thing missing is the guitar. There are several options. You could pick a RB2 Wireless Guitar for $60, not much to go wrong there. With $20 more, you could get the Beatles Guitar, which could be nice if you get the rest of the set. If you prefer the Guitar Hero controller, it would be the cheapest option, at $50. And, for $70, you can get the Guitar Hero: Warriors of Rock guitar bundle.
You'll be spending at least $360 on all this stuff. But your parties are never gonna be the same. :-)
EDIT: Ah, and if you want to crank it up to eleven, get this setup.
I'm fairly sure that if you use the Microsoft Xbox360 wireless adapter, because they use the same protocol, third-party accessories should pair as well. As far as drivers go, anything that works with the MS xb360 controller should work fine.
Best Answer
Following the advice in this review and Grasa's comment below, I was able to set it up like this:
This is as far left as I could get hi-hat. Note that this does not require you to pull apart any of the clamps, so you are free to experiment without incredible pain, and if you decide you don't like it, you can just put it back together the way it was.
How I did it:
Note that, yes, the green and blue cymbals are intentionally swapped from where you'd think they would be. This is because in Rock Band 3, the green cymbal is almost always the crash, while the blue cymbal is the ride, and most drum sets have the crash on the left and the ride on the right. This can make the game very difficult to play, and
I'm seriously consideringI have since swapped the green- and blue-cymbals back again.View from behind the right-side:
View from behind the left-side:
View from in front of left-side:
Hope this helps!