I'd preface this with the usual advice that nobody needs deep section carbon wheels for A4 racing.
However, if you want them, I'd say a lot of circuits can be a bit rough and that racing is hard on wheels, i.e. you see less potholes in a bunch and have less chance to avoid them if you do. With that in mind, buy something with a reputation for durability.
In terms of makeup, I'd either buy all carbon tubs or clinchers with an aluminium rim and carbon fairing. Aside from the rim heat issues on carbon clinchers, I wouldn't fancy dealing with any flatting situation where the rim is making contact with the edge of a pothole.
Also, be sure to buy something that you can get spare parts for, i.e. something built with generic spokes or hubs or, if proprietary, something where spares are easily acquirable.