Need some help setting up my TT

I'm not even sure where to begin. I have inherited a group of what can best be described as mid-fi equipment from my father over the years. While I eventually plan on improving my system once I'm out of school, for now, it has to suffice.
So, my main questions have to do with setting up the turntable. It is a Denon DP-51f (direct drive, pretty much completely automated), purchased circa 1984 by my dad. It currently has a Bang & Olufsen MMC5 cartridge in mediocre condition at best (my dad swears it's had light use, but the stylus is bent slightly to the right).
The turntable also exhibits a problem during play, where it will lift the tonearm for no apparent reason, begin to move it back to the rest position, and then drop it back onto the record. Needless to say, I have been hesitant to play much vinyl since that started.

My first question is, does anybody know a good place in the Dallas-Ft. Worth area to take it to get checked out?

Next, since it needs a new cartridge, any recommendations that should work well with this TT in the $75-$100 range.

Third, any idea of a clamp that would work well with this TT? It won't work with a screw on type, and I've seen talk of being careful with "suspention type" TTs. I have no idea what this means.

Any other suggestions would be helpful as I'm just getting into vinyl and would love to play it and treat it right. Thanks
a nice 'sure' cartridge can be had for less than $100. The denon, like other classic turntables is not designed to be used with a clamp, which is fine. just checkthe yellow pages for a local turntable specialist (rvrn onr that sells dj tables)....they should be able to fix the autolift.