Hi Steve,
It sounds like you need to decide which direction to go, $10K is a nice chunk of change but certainly not enough to do both (cnc retrofit and 3D printer).
I help at one of our local high schools and can attest to the fact that for that amount you should be able to get an off the shelf (minimum work on your part, and students can fabricate the servo/stepper adapter plates and brackets) retofit kit for your bridgeport and a lathe ... and possibly 1 or 2 seats of educational MasterCAM (#1 priority to consider is the programming software).
Perhaps you should check
http://www.machmotion.com as a starting point. There are a number of other dealers as well ... like
http://www.ajaxcnc.com just google cnc retrofit and park yourself for a few hours!
You might also want to contact MasterCAM directly to see what they want $$ for an educational seat before making any commitments!
http://www.mastercam.com
Just a couple of suggestions in case you were leaning towards the cnc conversion decision ... if you want to read some more info on retrofits follow this link to an overview
http://www.mendonet.com/cnclinks/overview.htm and then follow his links at the bottom of the page.
Good luck, Rob D.