IDQ 15" anything around 300WRMS-600WRMS it can take comfortably.
So... with this in mind.. the following amps get my attention..
Audio System Twister F2>300

or Precision Power DCX1000.1 Monoblock

Treo Engineering SSXD750.1

Either Alpine M605 or M1005 is plenty of grunt for the 15 aswell, also...
Audison SRX2s

Hope these are of use to you