As Jon said, Antares Tube and Albino are must gets, you'll need them for a lot of things you want to do in the future....

Waves Gold or Platinum are the packs you want, come with about 40-50 plug-ins, all very good.

I find if you create a bassline with one synth and overlap it with another from a different sounding synth gives you real good bassline, then distort it with a good distortion unit, add some bass with max bass as Tequila said and then EQ to your liking, it will take a while to get the sound you want but its soooo worth it when you hear it and you can say its yours. :D

Go make some fatass basslines.... :D