Preamp advice, all comments welcome

Hey guys, neat site I have stumbled onto! I am always very interested in the details and nuances of audio equipment. Honestly, some of the crazy stuff you guys do makes me wonder if it makes a difference. I guess i probabally couldnt tell at least.

Anyways, what I am considering is changing preamplifiers once again. I started with an HK825, then an adcom something or another, and now my McIntosh C26. Its funny, i like them all in thier own way. I just am looking for a different, more musical sound.

Now here is the REAL question. What would you guys reccomend for a preamp. There is no way I can afford anything over 500 bucks. I do like the sound of tubes. I was also wondering if there was any sort of upgrade that may keep me happy with my c26 for longer. (I am in college, and on a VERY limited income).

Here is what I am running for power amps. Still not sure which one to use for sure. I have a pair of adcom 535's biamping a pair of mortdaunt short bookshelfers (very happy with the speakers). I also have a hybrid amp (actually a car audio amp, with a 50 amp regulated power supply). Its a phaze audio tube driver amplifier, designed by butler.

Anyways, any thought or consideration is greatly apreciated. Thanks in advance guys!!!

Evan :)