Domenic,
A great deal depends on your ambition, talent and choice of engine.
I think the least I've heard one of our 427SCs built for was $26K, but that was when our kit was $16K. The owner did his own bodywork and used a junkyard 428 and Toploader that he paid about $2500 for. At the time, he bought all the suspension from us.
Some sample kits that are more finished than he got are listed
here.
Generally you will get the most bang-for-the-buck (especially resale-wise) if you don't throw lots of exotic stuff at the car. Keep it simple, while trying to maintain the authentic look. 390 FE engine, 4 speed, stock suspension with either Trigo 5 pin wheels or nice bolt-ons like Team III.
You might even consider an FIA, which might be a couple of thousand cheaper, mostly by virtue of a less expensive engine. If you are willing to live with the comp interior, subtract another 2 Gs.
Unfortunately, financing is generally not available for kits - the banks require some sort of more reliable collateral. Even though our cars have a great track record for resale, the bank will assume that it's not worth anything until someone makes an offer to buy...