I have a pair of the Orvis Pack and Travel wading pants and am very happy with them. As Steve noted Orvis was supposed to release a Sonic Seam wading pant last year but it turned out the convertible wader/wading pant was such a huge seller for them they decided they didn't need a wading pant in their line. If you want a very similar pant at a price point about 1/2 of the Simms G3 look at the Redington Sonic Dry pant. I have their waders and have absolutely no complaints about them after several years of use.

Brian