Does the power amp effect tone? Let's say I play a fender type preamp through a mesa 2:90, am I gonna get the same tones as a fender amp (or very similar)? Is this a good setup for clean jazz tones?

power amp does effect the tone, a great deal.
The Gear:

Custom Strat
Mesa Boogie Stiletto Ace
Fulltone OCD
Electro Harmonix Small Clone Chorus
Dunlop Crybaby Classic
MXR EVH-117 Flanger
Fulltone Soul Bender