Looks pretty good! My first suggestion is to search around for secondhand parts. Things like oil coolers and such that have no moving parts don't lose a lot of functionality over time, so get'em cheap, flush'em and then put'em on!
I took a pass on the oil pan spacer. It's not gonna really serve any purpose, especially with that oil cooler. I have a 34-row on my car and oil temps stay sub-200 daily and barely break 200 track time, even in South Carolina summer. I got a used F.I. 34-row cooler for $500 shipped.
I went S1-SE for my fuel return system and I would recommend it. I think the S2-SE (linked and priced for on your list) only adds a larger fuel return line. I have a buddy (Woo here on the forum) running the same setup as you are building for, except with the addition of the 9lb pulley, with no fuel upgrades (aside from injectors) just fine. The billet tophat is also a great choice!
For the fuel pump, I went with the Aeromotive stealth 340. 455 might be way more than you need but if you get a deal or something, no reason to pass it up.
I also chose the ID 1050x injectors. When I did my data runs on my second tune revision, I believe they were at ~50% duty cycle at my peak power production (I've put down 410/310 so far, wrong tune rev....).
I have an auto tranny, so I'll let the manual guys pipe in about the clutch.
As for exhaust, it's whatever sounds good to you, in my opinion. I went with a Borla catback and Z1 test pipes because I think it sounds great! But to each their own.
For your tune, talk to your tuner about the sensors for it. I went through SpecialtyZ and they supplied the pressure sensor. They are Ecutek and will give you tune support for a year. Also, Sebastian is pretty great as well as experienced with our setups (SC A2A).
The attached picture is a little disorganized spreadsheet of my build stuff. Everything in bold is on my car with the exception of the Z1 intake manifold.
I did my install in my garage over the course of a few days, if you have any questions, I'll be more than happy to do my best to answer them! Here's the link to my build thread:
Turtle64b's Stillen Build Thread.