Heh, I feel your pain Greggo. I only got GOMC1 a couple of weeks ago. So far, I have two painted Gangs, and my final one on the way, along with judges and the Death on the Streets expansion, basically, I am done and i haven't even had my first Campaign.
To be honest, its a little frustrating, but at least I managed to get into a miniatures game that allowed me to come out of it with my wallet aroun 80 bucks lighter.
The main things that I would want in support now would be
More themed gangs: Undercity, Ape, and Robot gangs were perfect for adding some more flavor to the entire game, adding to the fact that they only Cost about 20$ and you've got a nice product that sells Books and Miniatures!
Vehicles, Please!:From opening the Starter box, this struck me as something that should be addressed, Cars as scenery is nice and all, but I want to do a drive by shooting with my Top dog at the wheel and three gangers in the back yelling their longs out, talk about a Will to Fight check.
Go prepainted?: This one I am slightly iffy about, but considering their Evo rules, and the way that Mongoose is heading with its miniature games. Why not give us a new Boxed Set with Pre-painted pre-assemble gangs. Addmittedly, Some would dislike the permutation, but there is something to be said for "Just open them up and play." Heck, even include a pre-stated gang list, much like the Heroclix Boxed sets.
Dredd it?:I still don't know much about the Dredd universe, my only experience being what the books tell me. But there seems to be a lot of crazy and downright insane stuff going on in Dredd's World, why not some rules for gangs in other Megacities? I know most rules would stay the same, but I can't help but think about yakuza gangs facing off against Judges wielding lightsabers and dressed as Samurai...
Heh, just some ideas from me, a fellow new ganger, good luck, and may Grud be with you.