Alpine MRV-T757... 2 channel, 75wx2 @ 4 ohms... beautiful sounding amp... i have one laying around if youre interested... this thing is the shiznitty... it used to power my 2 memphis audio 12's and they rocked... so i can only imagine what the type r components would sound like... ive been eyeing those for years... tell me how they sound once you get it hooked up and all...
You should be able to find a Kenwood KAC-646x 4 channel on eBay fairly inexpensively. They're rated @ 25w X 4 @ 4 ohm stereo but they're rated for 70w X 2 @ 4 Ohm mono bridged.
Bulletproof little amps, small footprint, and pretty clean overall. I sold a matched pair of 'em on here for $100/shipped.