I run a pre-pro in my system (a combined pre-amplifier and surround processor that needs to be connected to multiple power amps rather than having built-in power amps) as I like the idea of one decent quality system rather than splitting funds between AV and music systems (although if I had a big enough house and I'd won the lottery, that's exactly what I'd do).
Unfortunately, there's a restricted choice of such products out in the market. I've used a Meridian Pro-Logic pre-pro for about 11 years and have recently moved to a Linn AV5103. However, Linn are out of that market and Meridian are only producing products in the stratosphere.
So that leaves Rotel (good value), Arcam (apparently a great product, but not exactly budget) and other esoterics such as Parasound. Now Bryston has a new product called the SP-3, launching at the Bristol Show later this month. It won't be a bargain, but its good to see some more choice. I look forward to trying to find a review!