Just my opinion of course, but:
a.) Not that limited of a print, unlike DDS.
b.) Probably at the height of its popularity because of the 2008 RPG and "Best Game No One Played" awards.
c.) Won't ever have a hard sequel that inspires people to go back and find the "original."
I think you'll see the regular peak around 100 and the collector's peak around 150 until the holidays when everyone forgets it for whatever the next big thing/next underappreciated thing is. Then your prices will drop to $70/$80 as the "casuals" who are simply buying since they missed it at release have now either played it or gotten distracted by the new stuff. The only markets left are the super-late adopters, people who refused to buy at $100, and collectors who will pay anything for a sealed copy. At that time your collectors will probably all already have it and the cheapasses will have probably forgotten about it. The market has shrunk dramatically, demand is down, supply hasn't changed all that much -- prices drop.
Look at Tales of the Abyss -- released at $50, went out of print, spiked to $80 used, today it's down at $55 used.
Long appreciation periods (in terms of price) are quite rare for anything, really. There are windows of time that resell prices peak, and at very least I don't think you're making much of a mistake selling at $100-150. I may be wrong, but I don't see it ever going much higher than that.