So I did my research (and got help here long ago) and got RB2 and BRB.

A co-worker is thinking of getting RB for her nephew (?) whom my wife and I have deemed as pretty musically talented. So now it's my job to do the research again and figure out the best deal for them to get a RB set going for him and his brother.

The conclusion I've come to so far is that I should suggest:

Rock Band 2: Special edition (guitar, mic, drums)
Rock Band 3 Bundle (keyboard)

Depending where they buy this will run about $240-300. In my estimation this is the best and cheapest way to get all of the stuff. Does anyone else have any suggestions or more info about importing stuff or keyboard parts for older RB?