Any suggestions on a useful one that wont run me too much over $50ish? (link me to a good one from radio shack so I can go pick it up!)
I'm not a good one to ask.
Mine's about 20 years old, and is analog.
Basically, any digital multimeter that has a diode setting, and a continuity setting, would be fine.
You don't really need anything super fancy for arcade work.
You'll be reading AC/DC voltages, and continuity, more than anything.
You want to know that whatever you're working on is getting proper voltage, and that the buttons/etc... are opening/closing properly.