Hey!
I like this character! Nice work! Would like to see a subd version!
About your question, the best way( I think) to animate the sub-d character is to bind the skeleton to the low-poly version and allso use it as a wrapper around the sub-d version...so you have two versions... Steven Stahlberg has a great tutorial about this!
Tutorial
Beauty is worse than wine, it intoxicates both the holder and beholder - Immermann"