I have been running Kumho Powerstar 758's in 155/80-13 on stock wheels for the past 5 years and love them. Unfortunately, they have since been discontinued. I just bought a new set and am not sure what I will do when they wear out (of course, I guess I could install my new set of VTO wheels!).
I got the Kumho's at Discount Tire and if you have one local to you they should be able to get you a set. My local store found some for me in Atlanta and through their distribution system got them shipped up to me for no additional fee. There are a lot of stores out there with 1-2 in their inventory.
I guess another slight downside is since they are discontinued, the tires that are available are 1-2 years old. Mine were built about 2 years ago. Since I burn through tires pretty fast (12-18 months) that doesn't bother me too much, but YMMV.