The only problem with VG is that without doing anything to it, it is very very thick. PG is much thinner. Because of that, vg doesn't work well in cartos, and won't wick well in other stuff. However, some companies, like jugheads for example, make their vg juice with that in mind, and thins it out enough that it works fine in any cartomizers, including your bloogs.
Bloogs are 808D-1 threaded, so if you want to keep using them, any 808d stuff will be compatible. So kanger cartos would be good, or if you want to upgrade you can get the bigger echos/vgo batteries.
If you are looking to upgrade though, it might be better to look at 510 threaded devices. They are more common, and you have a lot more variety with them. Both for the actual e-cigarettes, and the what you attach to them.
You really shouldn't worry about brand that much, everything is made in a handful of factories in china, so most of it is the same stuff. As long as the prices are competitive, you can't really go wrong no matter what you get.