I was considering the exact same thing. I have an oak HW-19 (so 80's - eeeeew! :-P ) and was considering painting it gloss black, perhaps with black flakes in a clearcoat. The gloss black would probably be OK, but I'm sure the flake would kill resale.
The biggest thing to me is to make sure the wood grain is filled (with primer) and sanded completely smooth before painting, and make sure everything is disassembled before painting, becasue you really don't want overspray on any working parts. Take lots of digital photos as you disassemble, and put related hardware into little baggies with whatever part it attaches so you can put it all back together when your done.