The reason the MixWiz is truly so desirable is the DUAL PARAMETRIC midrange controls. Their EQ is vastly superior to a Mackie or a Yamaha in that price range. The VLZPro series Mackie is crap. They will all give you ribbon cable issues at some point and their on-board shielding is for crap crap crap. They do make an awesome AM/FM radio at times. The Soundcraft is sort of a poor man's AH in that price range. They do make good for the dough boards, they just aren't up to AH level. The Carvin's are really nothing special. Keep your Mackie over the Carvin for "sonic performance". And friends.....don't let friends use Berhinger.
That said, there is no such a thing in the world that one mixer is better for "metal" over "Jazz" or "Country". Where does a bonehead get that idea from???? A board is a board is a board. I can mix any style of music on any brand of mixer. There is nothing that makes a board better for a "type" of music.
The Presonus Live series is very cool and yes you can remote control them using a PC and an iPad with a wireless card and a wireless router. So that's a nice feature. The new Soundcraft SI Compact series is da bomb in new small format cos effective digital mixers. Very sweet. Any analog guy in the world can walk into that mixer. It doesn't yet have the cool iPad/PC app, but it is in the works from Soundcraft. The Roland V-Mix is also a very friendly console. Love the digital snakes and the on-board recording ability (like the presonus and sadly unlike the Soundcraft which does not). Yamaha's are very nice products, but they are a pain to navigate compared to the better layout everyone else is getting into. Great thing about the digi boards is all the effects are built-in. Does the comp work like an LA1176N? If you know what one sounds like, then you must already have one and already know it doesn't. Is it as good as the ACP88, or a 166XL, damned skippy it is. Are the Verbs like a Lexicon? Well, on the Soundcraft, yes, because they are Lexicon DSP engines inside. On the Roland, well we all know Roland makes some nice effects both in dynamics and verbs, so again they are as solid as any typical cheap outboard gear.
Keep using your Mackie until you can go digital. Or hire a sound company, you won't regret that either.