I have the Steam versions. I'd say yes it is worth the $5, and occassionally its even lower on Steam. Aesthetically, the original is better, but if you don't care about the odd underwater weapons, the sequel has some better maps, and the sequel's graphic resolution is better I believe. I'd probably only order a newer version if it was highly original, or if it was a definite Civ4 expansion. A high quality FPS (e.g. Rainbow Six Vegas 2) mixed with X-com's strategic play would be interesting.