Crunchy But Not Too Filling

I was reading Schlock Mercenary and thinking what a awesome universe the author has created. And what a cool game that could be run in that setting. But which system would I use? Its a high-tech world with lots of techy gadgets. So a more detailed system might be in order. But I will now let you in o a big secret. I'm a lazy GM. I don't like to work hard to prep a game. I just want to have fun. And I have a bad case of ADD. So I don't focus on details to well. Hence my perchance for simple systems. So I'm looking for a contradiction, a catch 22 of RPGs. I'm looking for some crunch without much fat. Any ideas?