If I may have my late input the OCZ Vector is better than both of those SSDs you listed, although, a bit more expensive.
Nope. The Vector does slightly better in a few write benchmarks and that's not where an SSD shines. The 840 Pro wins every time in reads and every other test.http://www.anandtech.com/show/6363/ocz-vector-review-256gb/2
There are reviews that state the Vector is superior to the 840 pro in the 128gb capacity due to the 840's poor latency on the 128gb drives. At 128gb the OCZ Vector, and the Plextor m5 pro Xtreme are apparently the best drives. At 256+ it's the Samsung 840 pro.
There arn't many reviews out yet for the Plextor m5 pro Xtreme though, only a few for the regular m5 pro with Xtreme firmware, but the real Xtreme version had hardware changes as well.