The power supply is a bit overkill unless you plan on adding a second video card and or serious overclocking. "Gold series" stuff typically makes things just cost more in my opinion, but others will say different. Also 750 watts I think will do you fine even if you decide to go SLI with another GTX 570. Plus you would save money.
The Antec PSU is every bit the equal in electrical performance as the AX-850 and is noticeably quieter due to the CPX form factor. I have built with both cases and, to my liking, the Antec is the better case to build in. Aesthetics of course is subjective and I will leave you to your own devices there. That $150 can be put to good use elsewhere.
I'd buy the case window fan when / if ya add a 2nd GFX card
The SSD is the 2nd fastest at read speeds ... Corsair Performance 3 is faster but $60 more. However both are considerably slower in write speeds. If this is a concern because of swap file, temp file and scractch disk usage, the Vertex 2's are substantially faster in write speeds. The Vertex 2's just went up $35 and the Vertex 3's (550 Mbs) will arrive in 2nd quarter