Not a lover of the Tom's Tier ratings, Reason -
You will be hard pressed to distinguish between the SSDs in tier 1 -> 3 in terms of real life day-to-day usage. (Qualifier may see a slight diff using select few programs). With-in the top 3/4 tiers I would use reliability/least user problems in determining which SSD to Buy - Synthetic Benchmarks are not the answer, If you want to select based on performance, Find ratings based on benchmarks that use REAL programs as means of testing. DO NOT use Sequential Benchmark performance sway you - It is the Random 4K performance that is most import for an OS + program drive. Sequential performance is Only important when working with Large Jpeg/Bitmap photos and Video files regularly.
Personally, I do not buy Sandforce based controller Sata III SSDs, primarily feel that Benchmarks are inflated when Benchmark uses data that is highly compressable.
Of the 3 you listed - Recommend the Samsung 840 pro (and Yes Just bought one, sitting on my desk ready to install).
Currently have (Sata III):
1 256 gig Samsung 840 pro (unused yet)
2 128 gig Crucial M4's and 1 256 gig M4
2 128 gig Samsung 830, and 1 256 gig Samsung 830
(Both 256 gig M4 and 830 were bought on sale for $180 each)
2 120 gig OCZ Agility III’s - Blew that one, and NEVER again to buy OCZ.
Also have older generation:
2 Intel (one G1 and one G2), a Phoenix Pro and a Torqx + a Western digital blue
That's 14 SSds total.