Last time I heard, the A900 was very squarely in the middle the mid-fi camp, and not even on the high end of mid-fi. Lacks a bit of extension on both ends, lacks midrange and bass detail, somewhat loose bass, etc...it is a good all-rounder, but taken each component it isn't quite high-end, and unless the LTD is a huge improvement over the original, I wouldn't consider it high-end either. In terms of technical capability, it's on par with the HD580 and not the HD650.
Also, in terms of "limited edition" headphones, history here at head-fi has shown that headphones almost never rise in value. In fact, it is only a select group of headphones, usually high performers or excellent values (such as the HP-1000, HE60/90, R10, W2002, DT531) that manage to maintain or increase their value. Audio-Technica in particular pretty much releases one limited edition every year, and I haven't seen a single one of their A-series "limited edition" headphones, such as the A100Ti or the A1000, rise in value after discontinuation. I doubt the LTD will be any different.