Hey mordoten,
Like TT said, a fairly solid list. I'd be tempted to make a couple of tweaks though, mainly around your gunzmob.
Having the gunzmob gives you a really vulnerable BTS. With no armour save they are sitting ducks if you can't get them into cover.
A wiley opponent will position his objectives so that you don't have cover nearby to garrison into, meaning you may end up deploying close to your own blitz in order to find cover. This means that having your gunz in the 'back field' it also makes it easier for you opponent to avoid them.
I'd change it to this:-
Big gunz, with Zzap - 175pts
Big gunz, with Zzap - 175pts
Warband, UGE - 500pts
Doing this increases your activation count and, crucially, means your warband is now your BTS instead of your gunzmob.
The boyz are faster, have an armour save, are 30 models strong instead of only 15, and much more likely to rally (and shed blast markers due to the nobz)
Just my two cents....
Anyway, hope this helps/makes sense. Above all, the best way to learn is to start playing a few games with them and you'll quickly learn what works for you and what doesn't.
Let us know how you get on

Cheers
Reedar