Switch the PSU to the
600W version. Worthwhile for $10 more.
Get this instead of the Zotac from Amazon.
I would go for this
motherboard due to supporting more features for a few extra bucks. The current one is too cut down IMO especially, since you are spending so much already. If you must have SLI this is the cheapest board on Newegg that supports it
here or check out this
combo.
I would also switch the CPU cooler to this
one.