A shoddy interior is true of most American cars so you won't find many interiors that one would consider quality. From my perspective, the only American cars with a nice interior are Cadillac's. I have a CTS-V with great performance and a great interior (for a station wagon) but I paid a premium for that.
Corvettes are amazing cars to drive, they have crappy interiors unfortunately. Want better than corvette performance with a nice interior? Welcome to Porsche territory and a lot more money
You have to ask yourself though, do you want performance or a nice interior? If it is the latter you should probably not be buying either a Focus RS or a Golf R. There are cars out there with much nicer interiors for a lot less money.
If you want AWD performance then you will have to give up that interior unless you want to spend AMG money. I used to drive a Subaru STI, talk about a crappy interior! That AWD performance was great though.