If the TRIM starts to be a problem, is another option to buy a HD from Apple?
You could get an Apple-official SSD, but it's not something that you can just go to Apple.com and put in your cart. I know they mostly used Samsung 830s, Toshibas, and SanDisks (can't remember the model) with custom firmware if you ordered a machine with a 2.5" SSD. The issue is that these are expensive as replacement parts for slightly older technology.
I'd also mention that on the latest episode of ATP, Marco Arment and John Siracusa both talk about their experiences with SSDs and TRIM (both are not using TRIM at the moment).