Since the release of the new ork codex I have been hanging out to play a GorkMorka campaign.
For those that havn't played it before its pretty much necromunda but with Orks in Vehicles in the desert. Mobs of Orks roam around the desert looking fr scrap and beating the snot out of each other. There is ramming and jumping onto and off of moving vehicles, as well as shooting (not well) and combat. Its a campaign so as your Mob does battle mobster gain experience and injuries etc.
Its basically a ton of fun, you only need a handful of models plus you get to play lots of games and watch your mob grow. And more importantly its just fun, winning isn't all that important, you don't have to worry about comp, you can cry when you Nob gets killed etc.
Commitment would be pretty minor, a little modeling and painting work and only 1 night a fortnight.
So if you are keen (and obviously live in or pretty close to canberra) shoot me a PM and I'll email you the campaign rules.