The GTS kits start around 4 grand, depending on the options you want. I looked at several different kits, and preferred the Gerst. It's not cheap, but it's very well made, fits perfectly, and unlike some kits, the coil overs do not stress any part of the original car, as they are contained completely by the new K member. (See how the coil overs attach at the top)
I'm not using the stock steering column, so I can't give you an answer there.
