Wait and see, theres supposed to be a 2016 GT500 to follow up the GT350. And the GT might be 670hp for less money, but does it have all the bits and pieces engineered to work together?

The gt500 is looking more like 2017. And if it's anything like the gt350. Dealers will be marking them up by 20 grand. Ouchhhh. I totally hear what your saying about factory engineered bit. However the Ford racing blower is actually a roush charger, so i think it'd be pretty sorted out And I hate waiting lol. After the holidays. I'm gonna dive in further. And I'll let ya' know how it goes

Keep in mind that with the new GT350 your getting a lot more than just HP. The GT S550 with a supercharger is still just a base GT with lots more HP. In my personal opinion if I had the type of money your talking, I'd be going new GT350. Comes down to personal preferences though. Good luck whatever you do.

I come from roading racing back ground, so the 350 turns my crank.
If your drag racer or straight line guy the GT500 is the way to go.
I did SC my 08 GT/CS vert, but I also did complete suspension upgrade.

Rumour has the new GT500 coming in 18 and possibly being 3.5 V-6 with twin turbos
along the lines of the Ford GT, pushing 700hp. Now that could be all kinds of fun.
But I am sure rumours will run wild until its released and you can bet it will be more
money again, so start saving your pennies now :)

Actually will add this, with car manufactures fighting to be top dog.
It is great time to be car enthusiast :)