custom art can get expensive, but it really makes the cabinet special. I have 3 cabinets right now, but because I am moving, i decided to only keep one of them. i had a nice twin tigers cabinet with the sideart intact, and a decent dynamo cabinet that was a puzzle fighter cabinet, and then i had my first cabinet which i modified heavily and made my own marquee artwork for. when it came down to choosing a cabinet to keep, there was never a doubt in my mind. the one with the custom artwork was hands down my favorite cabinet. i liked the side art on the twin tigers cabinet, and i loved how easy the dynamo cabinet was to work with, but when it came down to it..I just had a stronger emotional attachment to the other one. ..
so i say go for it...do the custom art. but i would avoid the generic mame logo stuff...put some effort into it and make it unique...you will be glad you did.