i am clueless about systems!

My friend sold me 2 Memphis Audio 15 inch subs with box for $80!!

Well he told me they are dual voice coil and 600 Watts RMS. What amplifier should i get? i was told to get either a 1200 watt amp or a 1000 watt amp.

Are Boss amps good?? because i have found some pretty cheap 1000/1200 watt amps.

These are the amps i have found so far.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5747605456&ssPageName=STRK:MEWA:IT

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5747322132&ssPageName=STRK:MEWA:IT

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5746569178&ssPageName=STRK:MEWA:IT

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5747924967&ssPageName=STRK:MEWA:IT

BTW, Whats the difference between 2 channel and 4 channel amps?? Which amp is the best out of those four??

Thanks,
Robert

Mods- SVT Kit, SVT Dual Exhaust, SVT Struts & Eibach's, H.I.D's, CTA Intake, Hightowered headlamps. My 'Tour Car Club- www.HiProfileCc.com