Go for vanguard or if your pc is powerful, go for the superwave bundle
These synths are phat, and very analogue sounding.

http://www.kvraudio.com/get/907.html

http://www.kvraudio.com/get/1010.html

40 quid, I`d go for the superwave bundle.
Not many people use these cos they are by a little known company
But they are PHAT
http://www.superwave.co.uk/prod_tpro.html