Personal recommendations from me:
Superantispyware - fast, pretty comprehensive.
Spyware Terminator - not as good at removal, real-time shield excellent.
I've just started using Malwarebytes and that seems better even than Superantispyware, but I haven't used it more than a couple of weeks. The others perform well over months/years in a wide variety of computers.
See what others chip in for a balanced view. No knowledge of SpyZooka.