661 Kyle Strait's the default option- well priced, very effective, last a long time, very comfy. A wee bit bulky- but watch that, the reason they're so comfy is the bulk, smaller pads need to be tighter to stay on, big pads can spread out more, so it seems a bit perverse but usually big is better.
If you don't mind spending more, the Scott pads are much the same but with a hard cap. I didn't find them quite as comfy, and I'm not convinced the extra cost is worthwhile, but Jedi swears by 'em I know. Me, I can't see past the 661s.