Looking for an active x-over

Vital
Vital Posts: 747
edited May 2011 in Car Audio & Electronics
Here's what i'm working with now:

SR6500 and SR124-dvc

but at some point might go to active 3-way front stage + sub so would like a decent x-over that does either
2-way front + sub or
3-way front + sub or
3-way front only since sub can be "cut" by most h/us and amps anyways.

Budget is in $300s and i would like something real nice to last me for a while with as many tuning options as possible.
2008 Nissan Altima
Kenwood DNX 5140
Arc Audio IDX and XEQ
Polk Audio SR6500 active and SR124-dvc sealed
Polk Audio PA500.4 and PA1200.1