Hey Rally welcome to the forums!
First of all when you get into 3 piece wheels custom offsets will be available to you to make any wheel fit. To answer your questions about concave wheels. Concave wheels are simply a "looks" thing. They do not add any performance and are actually much heavier than regular wheels. I forged is one of the bigger wheel companies out on the market and they do a great job with their wheels. I personally run and sell Strasse Forged wheels... Great wheels with quality as the standard. If your looking for something unique but with a solid name and customer service I would recommend Strasse Forged. We actually have a mega thread on the forums with a whole bunch of different cars running them. Jamaica will have one of the first Concaves on his ride this jan/feb. PM me if you have any questions about wheels or are curious about strasse wheels.
Mike
