I know you said "marching style mallets," but I really don't like most of what is on the market for front ensemble... many are simply too big and bulky to foster healthy technique.
The Ancona series from Innovative, as well as some of the Casella mallets from Innovative are capable of being used as versatile, all-purpose mallets, but some of the outdoor mallets are more suitable as golf drivers than as marimba and vibraphone mallets.
My current bag includes:
Malletech - The entire NR series - Very versatile, for multiple pitched and unpitched percussion instruments.
Malletech - ES12 - Eric Sammut really designed a fantastic mallet. It speaks almost all the way up and down a 5-octave keyboard. I'm not sure why you would even need the ES16 (his harder model). I've used these mallets for a lot of the solo repertoire I perform.
Pro-Mark - BT2, BT4, BT5 - Blake Tyson's mallets. I have sets in a couple of different hardnesses. They work very well as graduated sets, but I've also used them all separately for many things. They're nothing incredible, but they get a good sound, have a decent feel, and the balance and playability is excellent with all of the sets I use.
Malletech - DF16 - David Friedman's vibe mallets. Great jazz sound, crisp and articulate with a rich fundamental. Nothing much more to say. What else do you need?
Innovative Percussion - Maroon vibe mallets - Can't remember the model number off the top of my head. Good general, softer vibe mallet. Versatile, particularly good for "legit" concert playing.
There's also a few different xylo mallets, bell mallets, concert and drumset sticks, brushes, rutes, etc. but I'll save those for another time.
