I'm impressed. A great selection of info is available here... and I was looking for some ideas. I hope you guys can help

I'm running at the moment a two-way + sub, actively, in the car. Now, I was looking for matching amps (at the moment an old Signat and a DLS CA41), and came across various QXs.
I can get hold of a QX150.4, a 90.2, 100.2, all for reasonable prices.
My question: is is possible to run a 3-way from these? The idea would be to use a 150.4 for midbass and mid, a 90.2 for tweets (as that also has both HP and LP with a real range), or is a 150.4 for mids and 2x 90.2s, one for mids and the other for tweets going to be a viable solution? At the moment, I'm just using Amp-internal crossovers.
None of these also have outputs, either, do they? So I need to have Ys or really have my 6 outputs...but even then, I'll need a Y for the Sub.
talking of which, how easy would it be to find a matching sub amp? I was looking for 300+W @ 4Ohms...
Tis would be an option, but then which ones without breaking the bank?
thanks!
Bret