Decide what kind of intake you want to do, and also if you want AC or not and start working from there. There is a lot of room at the front of an FC, so you just have to plan ahead and decide what accessories and intake you need/want and then get a radiator that will fit in the space you have left. The Corvette airbridge seems to be useful to keep things simple and allows you to run a vertical radiator, which makes mouting a condenser for AC easier. Check out Steve's (CMan) setup here with the Corvette airbridge.
http://www.norotors.com/index.php?topic=13733.0Mine uses a Howe dual pass radiator and a Spal dual 11 inch fan setup. I can give you the part numbers if you are interested. The radiator is laid down and mounts to the framerails. There is also lower bracket to give support to the radiator so it is not pulling on the air filter panel. A 4 inch tube is used for the intake. I did it this way for use on the track, and it works great. I don't run AC however.
From the front
