Ive always used the cheapo rubber ones that have the deep groves to catch water/dirt/snow/mud whatever in them. If it gets really nasty in the winter i go as far as using and old bath towel folded in half on the driver and passenger side floors for the people who can't seem to understand the concept of keeping their slushy shoes on the floormats. It looks a little corny but after a couple days you just wash them and put them back in, plus they absorb all the water that would have ended up filling the grooves in the rubber mats and spilling onto the carpet below.
FWI - PEMs - DP - HF Cat - 3.4/3.5 MPS - 180* - PCM - 104'* - Shift Kit - UD WP - Solid Mount - DR'*
14.222 @ 95.27 - 2.112 60'