Most current gen and last gen SSD's will perform almost identical in every day use. Don't fall for the trap of buying based on specs, especially advertised sequential read and write speed. Make sure you look at random read/write performance at low queue depths (ideally QD=1)... but what you will find is that they are all very similar.
I would suggest the cheapest drive you can find that's made by a vendor you trust. Given that, the m4 and the Intel 320 seem to be the best choices right now and use Marvel and Intel controllers respectively. If you want a Sandforce based drive, I'd recommend OWC drives. The C300 is probably the best 4K random performer, but I believe it's priced more expensive now than the newer m4.
Micron (Crucial) and Intel are both in the NAND business (in a joint venture) so it makes sense that they would bin the parts and choose the best quality NAND for their own products.
OCZ probably has the worst reputation for reliability, support, and even shady business practices. IMHO, they are focused on the enthusiast PC community where the tolerance for hassles are higher in the quest for the ultimate in performance... Characteristics that don't define typical Mac users. So while the Vertex 3 (with Sandforce controller) is the benchmark leader in most tests, I personally wouldn't buy one. It's slightly better performance will not be realizable in desktop tasks, it costs more, and it comes from a company with a less than stellar track-record of late.
That's my 2-cents.
