i have owned most hopper variations.
the thing is, there isnt much difference on performance.
what you need to look at is the following, do you want a rip drive, do you want anti jam, do you want tough shells
rip drives are very handy if you forget to change battery's, which means halo, reloader etc
anti jam, well the vlocity does this well
shell durability, this is where the rotor is head and shoulders above the rest. vlocity and halo's can be fragile.
another factor is ease to clean.
there is a shell for the halo and vlocity which enables this, and also gives better durability in the shell dept. it is called the verso, but, you might aswell get a rotor as it is included. also for the halo range there is a hybrid shell
the other option is the new kee hopper named the prophecy, but this is expensive, plus i cannot comment as i havent used it.
i currently own a hybrid reloader, 5 vlocity's and a rotor.
I normally use my rotor unless it is raining(no lid just speedfeed), if it is cold i use the vlocity with no tention on the stack.
as for speed feeds, virtue ones are excellent