The thing with the springs is that they really won't do anything without upgraded shocks/struts. Actually they're probably hurt things. Unless you plan on doing the install yourself, and don't mind doing it twice, it makes sense to do springs and dampers at once. This too will make a huge difference, but its costly. And if you did this before the other smaller braces and such, it won't be as effective.
The fact of weather a mbc works on a T7 or not is hugely debatele. Search around for this sort of thing and you should find lots of arguments. The people who have put these into T7's seem to use the smbc. I'm not sure if these are the only ones that work or not, that would certainly explain why they're used.