I think if you're comfortable with the setup and it's working for you, there's not a huge reason to change it up. Personally, I find the ProTank a little awkward with the smaller eGo batteries and find a better fit on my mod. I think my issue is because it's top heavy and tends to fall over easily when I stand my batt up on end. That said, it puffs well on my VV, so I would agree that it's a decent setup aside from aesthetics.
I've been really liking the eGo style VV batteries with a Kanger mini-Pro tank. It looks good, can handle any juice you throw at it and I get pretty close to the performance of the Pro Tank, minus the extra juice. I use cheap EVOD tanks for sampling and haven't had too many issues with them, but others have reported some. (I'm still new and haven't tried everything under the sun, either.) I'm kind of subscribing to the idea that the eGo style battery is pretty much a refined technology, so specific brand names don't make a huge difference, but there's probably some exceptions there with uber-cheap batteries. I like having one style atomizer to maintain, but that's because I've gotten into rebuilding them. If I was buying them new all the time, I'd probably open my options quite a bit more on heads.
Good luck and welcome to ECF!