Yes, you can use your amp on the two kickers at 4 ohms.  That's be just
under their recommended RMS power (150 each recommended, 137.5 supplied at
optimal voltage to the amp).  If your amp is 2 ohm stable, you could get the
TS-W306DVC as it is rated at 400 watts and if wired in parallel is 2 ohm.
Your amp would probably put out somewhere in the range of 350-400 @ 2 ohms,
which would work.  I put my TS-W306DVC on a 350 watt @ 2 ohms, and it sounds
great.  I don't know much about the Kicker's, but with 2 of them, that gives
you some extra cone area to move around.  I was unable to find the XMax
(maximum excursion) on the kicker sub, but the xmax on the Pioneer is 9.4 mm
(which isn't a ton really).  I would assume the kicker would be just a
little under that.  The larger the XMax is, the further cone travel you
have, adding to volume.  Anyhow, either way, the TS-W306DVC is a good
choice, but maybe someone who's heard those Kicker's can chime in and
provide some insight.

I love my Pioneer