To answer both of your question on how long im intending to keep this SSD, well: As long as possible.
As 'jsrudd' said "I don't think things like this are really necessary for modern SSDs." Are you saying that i should undo all the things i dis to 'optimize' my SSD? Things like disabling defragger, disk cleaup, system restore, disk indexing, page filing, hybernation, prefetch, superfetch, windows searching...
Basically most of these... http://thessdreview.com/ssd-guides/optimization-guides/the-ssd-optimization-guide-2/
And by the way, i dont have AHCI enabled as i have a Asus P5G41CM-LX mobo. Have consulted the issue here before and they said it doesnt really make a big difference