the only thing id ever reccomend vanguard for is for these kinda bass lines, i bloody hate the synth for leads and such but it can be very handy for bass as it gives out a rich bottom end.

a fair amount of amp attack is required to get that sliding sound and you can play with the filter envelope to get differnt kind of sounds from it, then maybe run it through quadrafuzz or a similar distortion plug in to alow you to alter the texture of it as a lot of the basses from the producers you have mentioned are usualy gritty in the mid range.

thats if you want a bass line that is going to change notes, if its a single note bass then you could do what starfuger suggests and play with some kick waveforms, a good place to start is soundforge as it has a tone generator for you to generate your own layers and experiment.