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.
SoundQubed 6.5 Pro's DD T2 Tweeters / Phoenix Gold Xenon 100.4
FI SP4 15 D1 w/ Tantric Sounds softies / DC 5.0K
Singer 310 6 phase 2 runs of Monster Cable 1/0 / Exide g78 AGM under hood and XS D3100 in rear
Plenty of deadener on roof, trunk, doors