The problem is all SSDs bellow 250GB are noticeably slower than 250GB+... You have to take that into account.
I wouldn't question your assertion there. But there WAS a time when the opposite may have prevailed: smaller was faster. And I only vaguely recall that -- so I could also be wrong.
So far, I've purchased four SSDs: A 128GB Elm Crest for Mom's system -- plenty of space left after OS, her software and files; a 60GB Patriot Pyro -- for the caching SSD in my ISRT configuration for a 600GB system drive; a 60GB Mushkin Chronos for my WHS-2011 boot/system drive; and -- a 500GB Samsung 840 Pro (MLC) which is still sitting in the retail box.
I have the option of using the Sammy to replace my ISRT configuration, or saving it for next year's new-computer build project. Since the ISRT seems to be still working tip-top after 30 months, I'm not in a big hurry.
For the 840 Pro -- call it an "offer I could not refuse."
Don't want to stir the pot here. I and others have contributed to threads about ISRT, and some say it's a "stop-gap" measure based on the higher prices per GB of solid state drives. Those prices have dropped, but you still pay maybe 75% toward the SSD for performance. The 25% could be spent on a single TB HDD.
If performance is 80% of SSD rated specs, you can have that speed for your habitually-accessed files -- programs and data -- on a 1+TB HDD with an investment of only perhaps $130 total -- provided that you have the ISRT feature in your motherboard's chipset.
I suppose I might recommend the simple SSD solution to everyone else. I just can't make up my mind yet about putting this 840 Pro in my ISRT-configured system.