Thanks JaredT, those are some great shots of your X. The pictures and info helps alot, I was a little worried about the clearence and even the width on the Snowcat. I have a wide board for larger feet and the snowboard holders may be a little narrow for it.

I've been doing a little research on other Thule/Yakima base systems and snowboard carriers and found that Thule does not carry any risers but a few of the Yakima products do. I think I'm going to go with the Thule 450R base + aero cross bars but am still undecided on the snowboard carrier. I'd post a pic of the 450R that's sitting on my PC desktop but I don't know how post pictures in these threads.