Hmm, 40 off with a 2500k doesn't work with that motherboard. I guess I HAVE to get the 2600k with it. If you price match, does the extra 80 off become void?
Here's an option you can also consider...
If you do not mind owning a Biostar mobo, you can buy the i7 2600k and the Biostar TZ68A+RCH for $29.99 for a total of $329.35 with tax
That mobo had received some nice reviews & is considered to be a good OCing mobo...