Since ROF is optimised for multicore cpus and a quad core cpu runs ROF 40% faster than a dual core then the newest Intel cpus should be a very good choice. Especially with the new 1366 socket as you will have upgrade path for next generation Intel cpus that will use the 1366 socket.
Here is a link to a high end computer guide at Sharkyextreme
http://www.sharkyextreme.com/guides/...le.php/3806051