@ javeryh and apfelanni: Cheers for the tips fellas. Re: the 60-in1-thing, I already have a mamefied Candy Cab and a (vertical) bartop for shmupping that play everything I want to play; this time, I'm going for the authentic PCB-experience, including a 4-way-stick. I know that the 100-in-1 upwards units are nothing but (relatively cheap) Mame-PCs, but according to everything I've read the 60-in-1-units are the real deal - no emulation, which is what I want. By the way, I checked out all Donkey Kong bartop threads, but there's still some info I'm lacking.
@BobA: Thanks for the info, I removed the link to the 60-in-1-pcb. Re: the monitor, I don't know man, if I can't emulate the scanlines via Mame, won't the picture look not-arcade-athentic at all? As I said above, I'd like this thing to be as authentic as possible (as far as it's reasonable).
So, does anybody else have experience with Jamma setups and Scart-TVs?