I love it! Haha I was looking at the one too. Tigerdirect was just the website I was using to browse for parts, I don't plan to buy from there because I heard newegg is cheaper.
Yes it is but since the egg is down for you tiger is good enough to browse for parts. That case right there has good cooling and a good look, should work out fine.
The 700w is a good one but you need need 700 watts either at all. I don't think Xion make the best PSU's either so you might want to consider a better known brand.
last time i checked it was the same price to buy 2 seagate barracuda 500gb then 1 750gb but that might im in the uk so prices are different but you might want too look that up the 500gb have faster seek times and in raid slightly better performance and the increase of gb's can never hurt.