well, my OS only actually needs around 45G to live, and surprisingly the 2.5" WD Blacks (which are available here for $70 for either the 500G or 750G capacity) are the 7200rpm stuff. I'm just wondering if / hoping that they'll be reliable and can run 24/7 like I need them to run. I checked the WD site and from their specs (so not real-life feedback from users), the 2.5" versions are actually rated for 600k load/unload cycles whereas the 3.5" are rated for only 300k cycles - and the 2.5" are also rated for higher shock (as they ought to be).
on the SSD, maybe ADATA stuff just isn't that great so even when I DO send it back under warranty, I'm going to get back another ADATA - they're not gonna send me an Intel or Samsung SSD as a replacement! :P
plus there's downtime - even if RMA process is as fast as a week, that's a solid week during which I can't do what I need to do.
(ya know, for the money I spent on the SSD I could have had a small Black, with change for a decent lunch)