Roof rack question / Thule fit kit or Yakima drilled option

[dasnake]

I am buying a 2007 or 2008 Toyota Yaris 3 dr hatchback.

I will be carrying 2 heavy downhill bikes, approximately 45 lbs each.

Thule makes a roof mount system (listed below) for the car which they rate at max weight capacity of 110 lbs. I If I were to place two Thule 594xt sidearms
(21 pounds each) on there plus two downhill bikes i would be over the weight limit by 20 pounds.

Thule system:
400XT Aero Foot Pack, LB50 50 Load Bar, Fit Kit KIT2196, Thule Short Roof Adapter 477

Yakima does not make a fit kit for the 2007/2008 Yaris. Instead they send you to a rack dealer who will drill your roof to lay tracks, install control towers and crossbars. I would put yakima highrollers on there. According to the Yakima rep, weight would not be an issue.

Which one of these two setups is preferable? Any other things I am overlooking?

thanks