Too bad that there is an expiration date on it.
Well, as far as games go, I have no idea what to recommend. But if you don't already have it, I would suggest a Stardock product for Windows... Object Desktop.
I was in the same boat as you..well, sort of (minus the coupon). I want to give Stardock my money but I think I'm all 'gamed-out' for the moment, with the exception of GalCivII, which I still do want/need and need it badly.
But one day I searched their software catalog and this particular product stood out for me. It seems quite nice, to be honest. If it doesn't go on sale before the 3rd of January (which marks the end of Impulse's holiday sale event), I will be sorely disappointed.