Sounds great! Unforunately I most likely wont be able to run your ENB on my system since it usually requires alot more power. SweetFX runs just fine on my system, with the exact same frate rates as without and GPU is a little less stressed actually. Even with MSAA on.

Evga gtx 560 ti sc
4gb DDR2 ram
intel core 2 quad 2,33ghz (OC 2,8ghz)