We could provide a lot more help if you followed the guidelines in the link from my signature. We need things like a budget, location, use of the computer, what you already have, monitor resolution, etc.
PSU: Don't get a Coolermaster. They aren't known for good quality. There's an OCZ StealthXStream 700W from Newegg for $55 after rebate.
Mobo: That Gigabyte is a good one. But for $40 more, you can get the Asus P6X58D Premium with USB 3 and SATA III support.
RAM: What's the CAS Latency on those sticks? Speed? You want at least 1333 mhz and at most CAS Latency 7.
GPU: Are you gaming? At what resolution? The 5770 is good, but can be overwhelmed at higher resolutions.
I'd recommend getting a Radeon HD 5850 if you want this build to last a while, because that's about $80 or so more than the 5770's and can marginally outdo two of the 5770's. That's my two cents, anyway.