If you think 120Hz is important, go for the Sharp or get a Sony 52W4100. Personally I looked at the V W and Z sets at the store, and could not see what all the 120Hz hoopla is about. The V to me has no more motion smear than the 120Hz sets as best as I could tell, certainly not several hundred $$ difference in price justified when I bought in May '08. The pic quality seems to have much more to do with the source material than refresh rate.
Prices are a lot different now though, hundreds less and differences btwn V4100 and W4100 probably isn't as much.