Ok, so I remember reading somewhere once that if you're stuck with a synth B3 model, like Native Instruments B4, you can run it out into 2 speakers and mic it to give it some "air." Anyone do this or something like it? Do you use guitar amps, keyboard amps, studio monitors? I once heard a keyboard organ sound run through a real leslie and it made me very happy

Usually the leslie's I see are pretty expensive, though.
Now I know it wouldn't really approach the sound quality of the real leslie, but what if you send the NI B4's stereo out to a pair of cheap studio monitors or something...face the speakers back to back, and put a mic on each speaker and pan like you might pan a leslie? The B4's already got a leslie happening in stereo, so between the two speakers you'd hear the rotation of the sound.
I'll probably end up trying this, but before I go spending money on any cheap monitors or the like, are their any better suggestions minus the real leslie? A leslie sim box would still not have the same sound as micing something in a room, so I'm trying to get a feel for what other people would do or have done in similar situations. Thanks for the replies!
-Mike
Oh, and I hate to get so technical about it, but if the monitors would work fine for this, what might I look at in terms of cheap (sub $300-400) studio monitors that would also do me well as an echo room speaker(s)?