I have not long ago just upgraded my pc:
Bitfenix Colossus case
MSI Z77A-G45 Motherboard
i7-3770k cpu with Hydro H80 liquid cooler
2x4Gb corsair vengeance ram Blue
750 watt OCZ 80+ Bronze psu
And i still get the odd stutter here and there and would really love it to run games like butter, I don't want something over the top just an average card tht will run anything that's out right now.