In my opinion the best value body out there today is from N&N Fiberglass Reproductions in Belleville, Arkansas, but it's a three window, not five. If it's gotta be a five window then your choices will be limited.
I'd be VERY cautious with Timeless Rods in GA. There was a recent thread where a guy was trying to do his "dream car" and ordered from Timeless, and he went through HELL. From the outside looking in it appeared that they were running cash poor, taking the down payment from one guy to build the last one promised, and getting further behind with each one. As I recall that fellow was about 18 months into the process, after being promised his roller in 4 to 6 months, but don't hold me to that. Just be very, very cautious.
Gibbon's makes a five window, but once again they've been through a ton of problems and left a trail of unhappy people. The guy who started the company built the name, and then his son ran it into the ground and all but destroyed the business. Again, twice cautious would be the rule, IMO.
One place that seems to be getting high marks is New Age up in the NE - New Age Motorsports & Hot Rods They make an American Graffiti clone that's one of the only glass cars out there with drip rails. One of the guys on here has been working on one, but hasn't posted lately, and another guy has become an expert on the precise details of the Graffiti coupe pieces and parts. Sadly he's been gone from here for a couple of years.

If you can live with a 3-window give Duane a call at N&N. You'll not be sorry, and you can take your chassis to him for the body to be built on frame, eliminating any issues of fit, shimming and gaps. N & N Fiberglass