Outlaw amps are inexpensive and people tend to like them. I've never used one. I use a Lexicon amp in one set-up and a Parasound 5250 in the other. They just came out with a V.2, so you might find a dealer that will have some older 5250's or B Stocks on sale. I've also used the Rotel amps. They tend to be a little warmer whereas I find the Parasound to be cleaner. For the preamplifier, I really like the Marantz AV7005. I personally didn't care for the Onkyo/Integra preamps, and found a nice difference with the Marantz over the Integra. One way to go would be to start with an amp, if your receiver supports it, and then move to the preamp/processor later on. Of course, you're only going to get out of it what your speakers are able to do. Separates really do depend on good speakers.
S~