Re: Mid Range opinions.
Put as much of the budget toward the front speakers as you can, even if it's all of it.. Then decide if you want to replace the rears. As for a suggestion, PHD has a heck of a line up. Check out the vids in the PHD vendor section for a taste.
Front stage: Phd FB 6.1PRO KIT, Active
Sub stage: 1st gen RE XXX 12" w/Fi recone
Highs Amp: Kenwood Excelon XR-4S
Lows Amp: Mmats D300hc
The Rest: AT 60 mil, Optima Redtop underhood and Yellowtop in trunk, Big 3 and front to rear +/- runs in Monster Cable 1/0