bridgeport end mill

Like Oldmanmopar stated above, look for the hash marks (scraping) on the ways. Make DOUBLE sure that there is way lube on the ways (can't stress this point enough)! Way lube on a machine is like motor oil to our engines, they need it to survive! See pic #4 for correct looking "scraping" of the ways.
The varible speed heads are nice and convenient, but the cheaper route maybe to buy the older belt change unit head. I've worked on some pretty old Bridgeports, the newest being from 1985. Good machines if they are taken care of properly. They are easy to do maintenance on. If you get a Bridgeport, get the corresponding manual for it, as it'll come in handy.
If you happen upon a Bridgeport with the head extension (a metal ring, between the head and the machine body), get it. They are Not rare, but are somewhat harder to come by, and can be very useful when working on large parts. I will try and post some pics comparing one with the extension and one without. Pic #1 w/extension, pic #2 w/o extension.
And like others have stated above, get any and all tooling/accessories that you can get. Check out your local Machinery Auction houses for deals on lots of tooling/accessories.
See pic # 3 for your automatic feed.
Good luck and let us know what you end up buying.
Steve~