Well...in fact I'd consider selling both of them which would land you with at least 450 or so with the prices you mention, and get a completely new amp. Only I would rather a.) get a POD XT or something akin to that used plus any amp that does good clean at whatever volume level you need for monitoring (then you can play all quiet & use it for recording nicely too) OR maybe approach it entirely differently and go for a tube amp plus some older nice FX modeler..I'm guessing you could get something like a ValveKing 112 and a Boss GT-6 for 450, which would be pretty damn nice a rig for anyone already...lots and lots of options out there.
But anyway, I'd check out what could you get for 450 and consider selling both.
Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.