What advanatge do you expect from being 100% modular ? Most hi end PSU's are hydrid modular. The "optional" cables are modular but the ones that absolutely must be used are hard wired to a) reduce failure points b) cut unnecessary costs, reduce resistance and d) increase efficiency. The last two are marginal but having a modular cable that must be used anyway provides no advantage whatsoever....so even marginal advantages offset 0 advantage in having those cables modular.
For comparison purposes , the list below contains performance ratings (10 scale) at jonnyguru.com / prices as per newegg on 12/31/2010 and ones w/ double asterisks (**) made it onto silentpcreview.com's Editor's Choice List meaning they excelled at both electronic and acoustic performance:
Antec SG-850 - 10.0 ($250) **
Antec CP-850 - 10.0 ($120) **
XFX 850W Black Edition 10.0 ($130)
Corsair HX850 850W - 10.0 ($170)
Antec TruePower Quattro (TPQ-850) - 9.5 ($150)
Corsair TX850 - 9.5 ($130)
Seasonic M12D 850W - 9.5 (NLA) **
NorthQ Giant Connector 850W - 9.5 (NFS)
Etasis ET850 - 9.5 (NLA)
Silverstone Zeus ST85ZF - 9.5 (NLA)
Enermax Revolution 85+ 850W - 9.0 (OOS)
Thrmaltake Toughpower XT 850W - 8.5 (NLA)
OCZ Z Series 850W - 8.5 ($165)
NorthQ Black Magic Flex 850W - 8.0 (NFS)
Coolmax CTG-850 - 8.0 (NFS)
SilverStone Decathlon DA850 - 7.5 (NLA)
Enermax Galaxy DXX 850W EGX850EWL - 7.5 (NFS)
SilverStone Strider ST85F - 7.0
Silverstone Element ST85EF 850W - 6.0
OOS - Out of Stock / NFS - Not For Sale / NLA = No Longer Available