Try getting such a great sound when you're tracking that you don't need to scoop any mids during mixdown. Work on controling your sibilance and plosives as a vocalist so you can work closer to the mic (proximity effect goes a long way). Keep the vox pretty dry instead of adding a lot of reverb in the mix. And try working the vocals in the box with a little multiband compression plugin if you have one. If you don't then setup a few auxilliary buses to compress filtered frequency bands seperately, like a homemade multi compression.

When you track the background vocals use a different mic and stand further back from the mic than you did with the lead vox. The same technique works even if you have to use the same mic. Remember, if you pull the mic back 2 or 3 feet from an instrument it suddenly sounds like a different mic than from 6 inches or 1 foot away. Then do something different with those vocals. Maybe scoop the mids just a tad by scooping out 3dB at around 1.3kHz with a Q of 1.0 or 1.5. That'll push them back in the mix some and seperate them from the lead vox.

Think about what you can do in the beginning to just track the vocals differently from each other. Then they all end up having their own space in the field of depth.

To CoyoteTrax. All of the strategies you have given me have worked so far. All of my tracks are sounding so much better. I mean thanks to everyone in general for all of the advice!!!
CoyoteTrax I have multiband comp plug-ins, )alot of them). What do you use or would advise me to use?!?

Thanks for the Guidance!!!