Check out American Leather. If you go to their website you can enter your zip code and see if they have a brick and mortar store near you.

I have been happy with Roche Bobois quality, although I do not have a leather sofa. Their general quality is excellent, and I know they have a lot of leather sofa designs.

I plan to purchase one in the near future from Casco bay furniture. Check them out.

I would recommend Hancock and Moore

http://www.hancockandmoore.com/

as one of the very best, followed by Taylor King

http://www.taylorking.com/

and Hickory Chair at slightly more moderate price points. Both made in the USA, and both well made to last with eight way hand tied springs, many cushioning options, and many many options in leather selections. None of the "order it online" types will be as good as the aforementioned, which will need to go through a retail store or designer. Leather options the widest at Hancock and Taylor King, a specialty for both mfgs.