Well, if you like the hunt, go for it, but I am definitely in the "the newer, the better" camp with makeup and there is never any lack of awesome new f/ls per year. Just this year, we've gotten It's Physical, Our Secret (another awesome one), Chilled (the only one I didn't buy, but only because I've got something similar already), Sassy Moss, Phlox Garden and now the three new ones in this collection. There's also that rumor Wholesome is coming back. There will certainly be at least a few more for fall through holiday, too. The new ones just get smoother, easier to spread, and more opaque than ones from even one or two years ago!
If you don't have Deep Fixation, you should consider it. Photos just can't do it justice. I literally own 2 eye shadows that I've BU'ed, out of a sizable collection, but I am seriously considering a BU of DF. It's the most perfect gently smokey, coppery neutral with gorgeous pink duochrome in it. It's just perfect in every way and puts all my others similar colors to shame.