It all depends on quality, what media you're capturing from. how much hassle you can cope with, and how much you want to edit. If you invest in AIW or Canopus your audio and video is less likely to go out of sync and the quality will be better than the less expensive cards. Are you capturing from an analogue camcord or video?
I've no experience with WMM (and some folk are very happy with it) but a prog like Sony's Screenblast Movie Studio click here will have you hooked in no time.