Unless the billet crank works out to be sub $1000, I wouldn't go that route given your plans. 5S & 3S cranks have been doing the hard yards for years without dramas.
 
With that GT3076 turbo, you won't need more than 8000rpm, in which case Eagle rods will hold up fine with the added benefit of reduced weight. If you do however, intend to go beyond that turbo & rpm limit, good idea to invest in Pauter/Carillo rods.
 
Another suggestion I'd make is to use a 3S crank for the better rod ratio. You'll still get increased displacement due to the larger 5S bore (along the lines of approx a 2.1L motor). Less hassle with crank gear & flywheel bolts too. I had a 3S block with 5S crank (not so far apart in displacement) & my GT3037 spooled exceptionally well. The better rod ratio should make for even better setup. In conjunction with the lighter Eagle rods, it'd be a nicely setup & priced motor. Btw, I really like my CP pistons 
 
I'd expect such a setup to hit 20+ psi at around 4400rpm. The below is with a restrictive exhaust/cat, but slightly smaller hotside GT3037/76.
 

 
Would leave you with a wide 3600rpm of serious fun to play with.

if you used std 3s crank then you'd use the std non stroker 3sgte pistons, you'd just need to get them in an 87-87.5mm bore for the 5s block

Thanks for everyones advice so far, and sorry I haven't updated this sooner.
A few things have changed in the last few weeks. 
First big change is I now have a W2A intercooler from frozen boost. 
I have decided to split my 5sgte build into 2 parts. the 5S will still get built but for now I have a 3S getting put together. The reason to do this is to use parts that I already have, saving money initially, get my car running again with this 3S an build the 5S once I'm driving again.
Bottom end is getting put together as I write this.
Includes: 3S gen 2 block
Ross forged 1mm over pistons
New Rings
Eagle Rods
ARP Crank Studs
ACL bearings
Gen 3 MLS head gasket
New oil and water pump.
Standard head, Standard cams.
Walbro 255lph pump 

I know this thread is old now though make sure you don't buy Ferrea oversized valves. Go with Supertech instead.
The Ferrea valves are faulty.