The only panels I have used are from C.A.R.S. I used their qtr panel on my current project,55 Chevy, and was very pleased with it. If their other panels are like their qtr's, they are top quality IMO. And yes - Danchuk is at the high end as far as pricing - but their products are top notch. I have been buying my products through Classic Parts Unlimited out of Washington for sometime.
Here is the link for CARS. Good luck.
http://www.carsinc.com/
Brent