please save yourself some time and don't use the search engine. The one fusetalk uses sux. So I'll sum up the comments of the last few weeks/months. The corsair units are surprising good, of high end quality, using nippon-chemicon capacitators (also used in the zippy psus) and generously large heatsinks. They use the same great smaller components as the seasonic psus and it even resembles the seasonic m12 off which it is based. On paper, it seems like a great psu for anyone looking to power high end dual gfx, however I havn't talked to many people that have bought it, actually only one.
We will probably see over time that this is a great psu, it is quite expensive and it may be easy to settle for a 500w or 620w enermax liberty. These psus are also very good, except, like you mentioned it's "eternity" modular system, which they kind of outsmarted themselves designing.
Overall, I would recommend one of the corsair units based on the specs, though if you're on a tighter budget and modular is what floats your boat, hit up the enermax liberty, a choice you won't regret.
What is your rig going to look like if I may ask?
EDIT: definetly take a gander at JG's page, his reviews are excellent and the corsiar units got his prestigous "jonnyguru recommended" seal.