Might go Active, add midrange woofer to my front stage, a amp...

So here's the current setup:
HU: Pioneer DEX P99RS (though in need of some serious fine-tuning)
FS: Rainbow Vanadium 2-Way
RS: Morel Integra Ovation
Speaker Amp: Alipne F4
Mono Amp: Zed Minotaur
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So obviously If I want to get full use out of my Head Unit I'm going to have to part with my rear fill and get some sweet midrange woofers (probably the vanadium ones..) which is fine because whatever I sell the the morels for, it will definitely cover the cost of the the midrange woofers.

I'm not well versed with active but I have a vague understanding of it.
Should I keep my Alpine F4 and get a separate amp for the tweeters OR sell the amp and get a 6 channel amp? (Space is of no concern to me, as I would get a behemoth sized zapco if thats what it takes. ) I figure whatever I get for my amp would cover a nice portion of a top notch amp.

Of course this is all only possibilities as if I find the current setup good enough when it is fully tuned then I may forget this expensive dream of an idea.

Everyone here has more SQ knowledge so let me know what you think.