RCI list
RCI has a list of Vegas timeshares on their website. Jockey Club is on the strip and is RCI. Polo Towers is on the strip but not RCI, they are Interval.
Other timeshares (that may or may not be RCI) that are on or just about on the strip are Fairfield Grand Desert, Marriott Grand Chateau, HGVC on the Strip, HGVC Flamingo Hilton. There are others, but they don't come to mind right now. Perhaps the more seasoned Vegas folks can weigh in.
Ones that come to mind that are a few miles from the strip are Club de Soleil, Cliffs at Peace Canyon, Worldmark, Grandview Las Vegas, and Tahiti Village.
It really comes down to how close to the strip you want to be, and what kind of accommodations you would like. I think the new Marriott Grand Chateau offers absolutely beautiful units, and it's right next to/behind the Aladdin with strip views. Of course, the price is a tad higher than your older resorts such as Jockey Club and Polo Towers.