^ amdfangirl is right, the stock cooler will be fine unless you plan on overclocking. The Antec Sonata case is an excellent case, but it leans more towards quiet over cooling. It's of sufficient width that it can use any of the better aftermarket coolers.
Check out frostytech for good reviews for aftermarket coolers.http://www.frostytech.com/top5heatsinks.cfm
Donuts are far superior to pie. Most pies are baked, donuts are fried.... i rest my case.