I've had good luck with some of the Gap cuts (long 'n lean, maybe Real Straight?) - they stretch out a bit and will form to fit me after wearing them a few times.

Also LOOOOOVE Chip & Pepper but I think the company has either gone under or is on it's way (not to mention, they're about $200 new). I've found 'em at Goodwill and Sierra Trading Post.

I have a bubble butt too, though, which is as much as a problem as the chunky thighs.