the litepower 450w got a great review, however the 600 and 700w models are made by the same manufacturer as the trupower RX series which have horrible reviews. http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913-9.html
I wouldnt risk it. Also the 700w is peak power, it is really a 600w psu (if it can produce its rated power.) I would rather take a 550w antec than a 700w thermaltake.