Or better yet, learn that getting a good bass sound has less to do with what synth you use, and more to do with how good your synth programming and audio engineering chops are
I haven't heard a synth in ages (RedSound Darkstar is the only one that comes to mind) that wasn't capable of awesome bass if you know what you're doing.
Just my $.02 though, feel free to 'buy' the best bass you can.