i usually create a bass patch on a synth or virtual synth... my fave virtual synth for bass is 'MUON TAU PRO' .. but i reckon the charachter of your bassline highly depends on the processing you do on it... i.e. compression, distortion, eq and stuff...
Have a look for a good distortion unit like 'antares tube' or something..

tequila - albino is the bollox!!! the saw leads are really somethin :D