type of spark plugs

while looking for spark plugs i see all these numbers and dont know whats what, what would be the best "performance" spark plugs
just looking on ebay right now
what about these?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7908628043&category=33693
or these
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7908763276&category=33693

ngk-r