I agree! Groovymame is fantastic. Big respect due to chris (bitbytebit) and calamity!
After years of playing mame on my cabinet (also running a D9200) and never being fully satisfied, knowing i wasn't playing at the correct resoltions, no scanlines, having to continually adjust the h/v size etc... BANG, i discovered groovymame and all my mame dreams came true!
Btw, i'd also highly recommend ves's unofficial Groovy-linux build if you ever get around to getting dedicated hardware for your monitor...