I have decided to split my amp in two. I've got my pre-amp, and I need to shop for a power-amp. I've never purchased a power-amp before. I've decided I'd like to run about 1000w at 4 ohms bridged. Is it safe to look for the least expensive amp with the most watts? Will the power-amp effect my tone in any way? Why do some amps with similar power have such different price tags? Are the only benefits to buying more expensive amps reliability, construction and features? I've been looking at the Crown XLS 402 and Carvin DCM 1000 as possible choices. Does anyone have any other brands or models to recommend?