You really should consider the MVP 2.0 if you are looking to upgrade from your Spinner. It is on sale on a couple of sites and you cannot beat the 2-3 day battery life and the functionality. No need for extra batteries or a charger. It's all self contained in a powerful little package. Some are put off by the box-mod style, but I tell you what, it just freaking works. I have been rebuilding my Protank heads for a while now and just love that I can easily check them on my MPV. I finally have my build just where I want it with GRAND results. Good luck to you!
Don't really know why but I like the look of tube style more, but I think after this first mod purchase I'll probably at least get one to try it out, especially since they aren't crazy expensive and have internal 
Thanks for all the advice and input!