I don't know of anyone else that has the Nova 2.5's and the new rebuildable Stardusts. If you know, point the way, I'm all for better prices!
Here's my 2 cents worth.
From what I understand there is no such thing as a v2.5 vivi nova from Vision. They make the 2.0 and Got Vapes changes the wicks slightly and sells them as 2.5's from what I've heard - to little or no effect. People have brought out micrometers and measured them and there is no physical difference besides the wick. So in that respect the OP is right.
As for rebuildable stardusts. Tell that to my junk drawer full of "new" stardusts I busted trying to get them apart. They aren't rebuildable any more. Only the version 1's were possible to get apart without a hammer. That's why the Vivi Nova even has a market. No one would want that ugly duckling if it weren't easy to rebuild at 3 times the price of a stardust, even if it does have a bigger capacity. Stardusts are so small you can carry a bunch of them around in your pocket. Vivi Novas however, they'd fill your pocket in a hurry with their bulk.
To the OP: Shame on you for not doing more research and letting the vets of ECF do the legwork for you with their superior knowledge and experience. You get what you deserve by overpaying for crappy products if you aren't willing to do the research before jumping in the pool. No wonder you're cold. Test the water first.
Sorry I might be coming off as a bit harsh but the fact is that a fool and his money are soon parted and if you play the part of the fool you will soon be broke and upset, and thus have no right to pi$% and moan about it. Don't be a fool, do the research, read up, let other people test it, watch youtube videos and get an eye for it yourself before you pay into things that suck and find out the hard way. I might sound harsh but the reality of the situation is much harsher than I could ever be.
If you want a good setup get yourself an ego twist or 2 with a charger and pop on a couple vivi novas with some DIY juice. There are hundreds of winning recipes right here on ECF. Get the right gauge of nichrome wire and the right wick and kick back knowing you did it right on the cheap. Don't be an pioneer, be an opportunist. Heck if you don't want to do that, Steeljan has videos on on youtube how to easily make your own genesis atomizer with SS wick out of a humungomizer if you want to go that route. To date Vaping has cost me less than 200 bucks and I can go for months with what I have now and then I might spend another 50. Had I smoked this entire time it would have cost me much much more.