FFRs are great in my opinion. However, first you need to determine if you want to build your Cobra yourself, or do you want to buy either a completed one or a turn-key minus engine and trans kit. Next you have to decide how big you budget is.
If you want to build it yourself (I did), then you will want an FFR. If you want either a completed or turn-key minus, you can choose from several good manufacturers, including FFR (they have builders who will complete it to any level with your selected options). Options as to engine, smog and related are important considerations and are controlled by the State in which you are going to first register the car. Don't over look this factor.
Regardless of which of the top manufacturers you choose, the resulting car, its quality, finish and looks will be dependent only on your budget. Once completed, the top cars look and perform (with similar options) about the same.
I recommend that you stick to looking at FFR, Superformance, ERA, Kirkham, and maybe a couple of others. These offer a wide variety of base prices and levels of completion to choose from. Recommend you stay away from any of the smaller manufacturers and ones who have not been in business a long time, or whose sales are declining. Replacement body and chassis parts could be a problem. Street Beasts seems to have problems, you can check the posts about them on the various forums.
If you plan on racing it, FFRs are lighter than the rest due to its aluminum interbody panel construction, their frame is also very strong. FFR also has a Spec Racer kit, which is pure race version with some different construction features.
Take your time, 3 to 6 months of research, ask lots of questions and go look at the shows, and only talk to people who actually own one. For good specific information about FFRs, go over to
www.ffcobra.com
Good luck and welcome to the family.