I'd keep the Stratos powering the front 2 channels, buy a relatively inexpensive Denon receiver(or similar) with preamp outs to handle processing and power for center/surrounds, and put your money into a high-quality stereo preamp for critical 2-channel listening. Hook the front L/R preamp out from the receiver to any line-level input on the stereo preamp(or the tape loop) and you're good to go(you'll have to volume match the stereo pre for surround/movies unless it has a home theater pass-through option). This way you maximize critical 2-channel sound quality(I'm assuming since you bought the Odyssey you care more about stereo performance) and minimize the expense on the other areas that may be less critical to you and that you may need/want to change again as surround formats continue to evolve(as opposed to blowing big $$$ on a pre/pro that probably won't sound as good as a quality stereo preamp and may or may not be truly upgradable for future formats). Best of luck.
Tim
Tim