dnl,
Do you really need to listen to your monitors while tracking if it's bleeding? If that was a problem for me, I'd make sure my levels are set and sound decent, and start recording with the monitors off or down. You'll know/feel how the take went and do it again if you need to. The small snippits of voices in the mics before and afte the songs can be fixed in mixdown by pulling down those faders or the stereo track.
Also remember, bleed is not the almighty evil thing that everone makes it out to be, it can really add to ambience, but you need to know how to control it. You can make sure your condenser is set to cardoid and not omni or figure 8.
Use headphones to monitor signals while tracking to keep stuff out of the mics too. Oh yeah, tell everyone to shut up while you're tracking!!!!
There's plenty of ways to get around your problems, just gotta be willing to try a few different things.