Could use some amp suggestions

Hi I was hoping someone could point me in the right direction for an amp. I currently have a pair of infinity kappa 8.1 speakers that really need a 300-350 watt 4 ohm amp. I was looking at a used adcom gfa-555 but would really love some other options as well. Multichannel amps would be great because I would like to add a pair of kappas to the surround but I'm not sure what I should look at...not really an audiophile as you can see. Any help or suggestions would be greatly appreciated. Thank you in advance.