Personnaly, I have other preferences (corsair force GT, if I could get one in the uk, I would get a mushkin chronos but they are hard to get here). However, I would go for the Kingston 120GB. Uses latest sandforce technology and is brilliant all round. However, as long as you get a 6GB/s one, it is then just down to the brand and its customer service and reliability and the space and money. Think of these aspects before getting an SSD, all SSDs are mind blowingly fast, you won't be disappointed!
if you can afford the extra £20 for the kingston id say that, i couldnt afford this so stuck with the 320, but either will be amazingly fast compared to a standard drive
I just received my laptop with a Kingston 120GB this week and I have to say I'm really impressed. It's amazingly fast. ATTO confirms 500-550+MB/s with extremely steady transfers. Even transferring 512 bytes is shockingly fast too.
Obviously I can't comment on the long-term use, but it's definitely impressive.