I went with the 64GB crucial C300 which is SATA3 drive with good replies on sites.
I hope it will be good...
Is SSD caching relevant?
If you can put a significant portion of the data you normally use on the SSD, then the Z68 cache will not be helpful.
If you have a hard drive with lots of data, then you might assign 20gb or so of your SSD to act as a cache for your hard drive.