absolutely amp them... a 100w rms x2 would be good if not more..you will coax the bass out of the speakerss with an amp.
I would run an amp to them, they will sound better. At the least, amp the fronts as the rears are mainly for fill.
agreed. don't bother with the rear speakers they are worthless in a properly set up system.
DIYMA.com is a place i frequent for my audio knowledge.
hang out there for a few weeks and you'll pick up quite a bit of info.