I used my Thule I had on my other car (VW Golf). It will hold either snowboards or skis. The only change I made was to buy the FatMouth Clamp to connect it to the factory cross members.
Found these prices at REI:
Thule 6 ski carrier (also holds boards) $110
or,
Thule 4 ski carrier (also holds boards) $100
FatMouth Clamp $35
Locks and Keys $22
I've had my rack for over 8 years now and it has no major wear. I use it all the time and its on all winter. The Fatmouth was a bit more expensive but I can use it on any type of bar (ie thule, factory, yakima). I see it as an investment. Personally, I like the looks of the Thule over the Yakima. Rounded look I think goes well with the 4Runner.
Later,
G3 Trout Runner