I am planning on buying a microkorg. I'm not sure if I'm going to need to buy another synth to use strictly for low-end powerful bass sounds. Are there settings on the microkorg that mimic...say, the moog rogue or the novation bass station? Thanks.

no. but if you like the microkorg so much, buy a korg Z1 instead, its much better and has 12 voice polyphony instead of the lousy 4 you get with the micro and MS2000, and it does more kool stuffs.