GS series are better in terms of performance, while the Kingston's V series are more reliable. The Kingston's V series should be much cheaper than the Corsair's GS series for about $50, unless you don't live in the US or Canada. For the price of GS you can get Samsung 840Evo, much better SSD than the Corsair's GS or Kingston's V series
I normally recommend Samsung. The Samsung ssd's provide excellent performance and have a proven track record. Crucial, Intel, and Plextor are also worth considering. Lately SanDisk has been coming on strong.
I maintain the ssd database listed in a sticky at the very top of this forum section. Here is the link: