Okay I just finished building mine. As far as the 5770 goes, it was too long and my old 4850 was too long to fit in this case. I went back to newegg and ordered a 5750 instead with a single i/o and it fits perfectly.

i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core
DFI LANParty MI P55-T36 LGA 1156 Intel P55 Mini ITX Intel Motherboard
ASUS EAH5750 FORMULA/2DI/1GD5/A
G.SKILL ECO Series 4GB (2 x 2GB) DDR3 1600 (PC3 12800) F3-12800CL7D-4GBECO
OCZ Agility 120GB Solid State Drive
PLEXTOR 24X PX-880SA LightScribe Support
LIAN LI PC-Q07 Mini-ITX Tower Computer Case
Scythe Big Shuriken SCBSK-1000 120mm CPU Cooler
Mushkin XP-650 psu

i put a papertowel roll in to show scale