I installed a Thule Evolution 1600 on my 2006 in December and drove from Seattle to Phoenix and back during the holidays. This model has the following: 1. Comes in silver top and black base or all black. 2. 16 sq. ft. capacity. 3. Length goes from front edge of spoiler to back edge of moonroof -- no interference with either. 4. 34 inches wide and you can open it from either side -- accessable from either side when standing on running boards, or stand on the back when barn door is open. You don't need a ladder. 5. Noticeable wind noise but still very, very quiet. 6. Traveled in heavy, heavy rain and heavy, heavy snow and no moisture came inside. 7. Easy to install -- 1 man can do it alone. 8. It looks very nice -- as though it was made for the GX470. Check website: www.thule.com for your local source or online specials. I got mine from REI -- in stock.
Installation advise: At the point where the U-bolts clamp to your roof rack, wrap it with a 2 inch heavy tape. This will prevent any metal to metal sliding. I understand the new models are going to have a rubberized pinch-clamp instead of the U-bolts.
Hope that helps. Reply if you have any questions.