Unless you set up and manage hundreds of computers, keep in mind that any personal experience you have regarding any company represents a very very small sample size that cannot be accurately extrapolated to draw any meaningful conclusions on quality and reliability. You're just getting unlucky.
GS700 is decent, not top quality though, but it shouldn't be having problems. You can RMA it.
If you want something new that's modular, Kingwin Lazer Platinum 550W, Kingwin Lazer Gold 700W, and XFX XXX Edition 750W (formerly known as the Black Edition) are all about $120 or under:
The first two are high-end Super Flower designs whereas the last is a high-end Seasonic M12D (but with a cheaper fan). Overall those brands have worse customer support than Corsair, and these (except the Lazer Platinum) aren't better than what Corsair offers in the high end, except in terms of price.
Some reading material on the above units...
(for similar LZG-850)
(same design more or less as the LZG)
(again, same design as used for LZG)
(XFX BE 750W)
(XFX BE 750W)
All of the above are better than the OCZ ZT and way better than the older ModXStream Pro / Fatal1ty that would be under budget, though the ZT is fully modular. OCZ ZT / Rosewill Hive aren't bad options though, just cheaper and not as good. Corsair TX M is a bit overpriced. Often the NZXT Hale82 / Seasonic M II (650W and up) are too, though those are the best of the bunch other than the three I linked and others that would be above $120.Edited by mikeaj - 3/31/12 at 2:39pm