Amp and Pre to match Wilson W/P 8 and others

I've bought a used pair of W/P 8s, and have also tentatively booked an AMR CD-77. I also have an eye on the Wadia 781i. Would also like to have a TT later on, but it'll bust my budget right away.

Having said that, my favourite cds are U2's The Joshua Tree, The Matrix soundtrack, Gladiator soundtrack, Pearl Jam, Nirvana, Metallica, Dreamtheater, REM etc. My wife though, listens to Diana Krall, Norah Jones, Pink Martini, Fourplay and the like. We're beginning to like the O-Zone Percussion group too.

Given the range of music, what pre and power amps should I be considering? My listening and HT room is around 14'x 26'x 11'. I intend to have a projector and use the Puppies for HT as well.

I come from Malaysia and auditioning here is difficult given the tiny size of market, and I've yet to receive the W/Ps and Cd-77( they're for a new house). However given budget constraints I'm fishing in the used market so I have to act when I find the right items. In other words, I can't get auditions and have to be ready to pull the trigger whenever.

Budget is around 15-20k US