Your picture and "Arcade" text are great for simplicity and better bang for your buck..
I personally wouldn't use the mame text underneath, but that's more because I wouldn't put any mentions of the word "emulator" on my cab, since I feel it destroys the experience.. from a purely image standpoint it's fine... it doesnt steal focus from anything and it's not too big or not too small..
The word "trebeck's" suffers in my opinion, though. For ideally what is supposed to the second most important word on your art (the first powerful obviously being "Arcade"), it's tiny and in a very thin font... . I can see you want to go with a script font angled, which is a nice effect, but I would definitely use a thicker font to give the text some more punch so it doesn't dissappear entirely, which is what it does now...
you can look through some great fonts at
http://www.dafont.comNice clean work all around, though.. Good Job