Try a mesa trad 4x12.. you will never want another cab ever again..
until you start having to move it 3-4 times a week.
on the other hand it's a killer cab. personally i have had experience with both (mesa 412 and the g-flex) and i would choose the genz for a gigging cab, but i might choose the mesa if i wanted it to look cool under a dual recto head. as far as sound quality, i would give a slight edge to the mesa, but not enough to justify the extra weight and cost, imo.
i would stick with the genz for a while and concentrate on practicing, cause that's what will really make you sound good.
as far as avatar, they are budget priced but they use quality components and their construction is surprisingly good. they offer many more speaker options than either mesa or genz, including multiple type configurations. pretty impressive for a budget company. as far as i know they don't offer a ported guitar design like the genz but for a standard sealed or open backed guitar cab, they're top notch. heck they even offer line-x spray coating.