I agree, that's a very nice birthday present.

I don't think $20 is too much for it. On the contrary. The single is great in itself (the Ferry Corsten mixes of "Whatever", "appears" JP's SoundFactory Mix, "immature" JT Original CM Version", etc). Plus add to that the fact that it was produced in a limited run and has long been out of print, I'd say it's worth much more than that.
Enjoy it!