i have upgraded my front and rear speakers. should i go with a 2 or 4 channel amp to power them? the front speakers are infinity 6.5" with 75 watts RMS and 275 max. the rear are 6 x 9's with 100 RMS and 300 max. if i'm correct, the main thing i would lose if i go with a 2 channel amp is the ability to control the balance? or should i go with the 4 channel amp? what are the pros and cons and what do you reccomend?

i also would like some reccomendations of amps for under $200. thanks guys.