pro logic unit instead of 2 channel preamp?

Hi Folks,

I'm shopping for a pre-owned pre-amp to match a rotel 980bx I recently bought. Logic says to go with a matching rotel preamp, but maybe there are other ways to go? I'd like to spend around $300 if possible.

I'll be using the system for 2 channel listening, but my tv etc will also be playing through it. Inputs will be: cd, dvd, wireless itunes, vcr output. Currently I use a pro logic Denon receiver and run video through it as well. I don't mind losing video and only running audio if the quality is much better.

I only listen to 2 channel, but might choose to add a sub one day. My main goal is the best music reproduction I can afford for my budget. My speakers will be DIY MTM configured bookshelf speakers that I'm building.

-- what do you think about the older Rotel Pro Logic Surround Units as a dedicated 2 channel preamp? Can they compete sonically with older 2 channel pre-amps? (say, something made in the last 10 years?)

Any other pro logic preamps you'd recommend? I ask because it seems that there is no demand for a non digital processor, but if it reproduces great 2 channel stereo, then I'd be very happy.

-- what do you think of the Chinese tube preamps on ebay? (Ming Da etc?)

-- any other pre-amp suggestions for the $300 range used?

thanks so much for any suggestions

Steve