I tried to use Negatron but it supports computers/consoles only and NegaMAME supports arcade games only. The developer said to me that he wants to merge NegaMAME into Negatron in a near future but until that happens, I'm looking for another alternative.
Tested both Launchbox and GameEX and GameEX is pure crap!! For a paid frontend, I was hoping to see a more decent piece of software, but instead it is a very heavy mess and it freezed my machine before I was able to start using it... garbage!!
On the other hand, Launchbox has a more decent interface but I need to test it further to see if it does everything I need.