Preferably a Marshall, Peavey or Roland. Anything over 30watts is fine, bladeage at gmail dot com if you got one!
If nothing works out you can check out musiciansfriend.com. They have free shipping on orders over $99 + no tax. They got me my stuff in just a couple of days (3-4).
IMHO, stay away from Peavey and Roland, and check out Fender. Tube amps are the way to go if you want tone to go with your volume.
i've got a marshall mg250 in near brand new condition, there's just a slight problem with the fan, it takes a second to start up. it's about 2 years old. how much are you willing to pay? i was looking for 325-ish