Need help again with i5 gaming build.

I need help again on making the choice of i5 655k or the i5 760.No sli or crossfire,overclock yes,up to $2,000.00 from
www.skycomp.com.au with air cooler only and this is for online gaming,web surfing and you tube.An high end gaming
machine would be nice,buying time in 12 days.The monitor is 21.5" led full hd and i watch blu-ray movies as well.
Thank you in advance.Any help and suggestions would be appreciate.