There is much hype with SSD benchmarks. Fast sequential reads and high IOPS seem to be the performance metrics.
Unfortunately, that is not what we normally do. The OS does mainly small random reads and writes. It does so at relatively low queue
The actual drive response times are what matters, and those response times do not differ much among all SSD's.
The SSD gives you much better response times compared to even the fastest hard drives.
Newer drives tout the benefits of 6gb sata, and they do show up well in synthetic benchmarks.
But how many apps do you run that do sequential processing?. If it is enough to make a difference, you probably
can't afford the price for the capacity you need.
As to which brand, I think the safe choice today is Intel. They have had much lower return rates in the past:http://www.behardware.com/articles/810-6/components-returns-rates.html
My take is, get the capacity you need and don't look back. A SSD makes everything feel so much quicker.
Look at the Intel 320 series today.
In a year, expect the prices per gb to be much lower.