Galaxy, don't make a decision until you take a good long look at Unique Motorcars. Definitely one of the best replicas out there. Beautiful body lines and more faithful to the original than most. The Deluxe pallet car option is one hell of a deal for the home builder and includes details that add additional cost on other "kits". The build is a breeze but involved enough that you feel like you are intimately familiar with the car when you drive it and the owners offer you a real friendly, personalized service that is all too rare in business these days. The price is super competitive when you consider all the extras and details and the finished car rides and handles beautifully. A real cut above many of the others out there. here is the link to their website:
http://www.uniquemotorcars.com/
Having said all that you couldn't go wrong with an ERA - still the most beautiful Cobra out there, bar none. Quality is top notch and the same thing said about the owners/management at Unique apply here also.
What more can be said about FFR? Hundreds of happy and loyal owners can't be wrong. You seem to be well informed about the pros and cons of this popular and successful Cobra.
Ditto for SPF - not much to add over and above what has already been said other than the fact that many owners who are experienced with cars from other manufacturers say that the SPF offers a level of fit and finish and overall "feel" that is closest to a "normal" or factory mass produced automobile.
All great choices depending on what you really want but if a great build experience, reasonable budget and authentic lines are important, you gotta check out Unique. I'd be surprised if anyone will disagree.
Good luck with your search and welcome to the awesome, crazy world of Cobras.