i heard the crescendo's in a tahoe and they put out some good midbass. i also heard a set of focals in custom kicks but the midrange was so loud it was annoying. depends on the build i guess
infinity's would be a good start for the money and i've heard audio q makes a pretty cheap, decent sounding set as well. powerbass may have a good set too for the price
have you considered an external crossover or electronic crossover. i remember buying capacitors back in the day to block out a lot of the lower/mid bass to reduce distortion
MECA's tough with the fusing. Stinger hi-amp fuses held up the best for me if you can find them. Still would blow 2 80 amp fuses in M3 off 2 Mmats HD4000s or 1 massive D16000. They would hold 2-3 seconds on average
I've seen 6 10's with a 12" external port and 2 10's both with ports firing straight back doing in the mid 150's. Enclosures were not that tall either.