Ok heres what I can do:
Id check out some other motherboards, like
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157293 or
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131837
You could go with a better/larger ssd, so you could put your favorite games on there for faster loading times. Try ocz or samsung.
Graphics card definitely needs to be changed, so try 660ti, radeon 7870, or radeon 7950. All of which are great options.
Maybe check out a modular power supply, because they're cool.
Personally, I'd go with windows 7, because it is better for gaming (which i assume you are building this to do.)
You say you're trying to keep the cost at around $1500, but this build is only worth $1100. You could always go for some more luxury options, if you'd like.