this should be just fine assuming nothing is odd about that case. http://www.newegg.com/Product/Product.aspx?Item=N82E16817153165
you can probably get away withhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817153023
but I like to have a little head room.
I and a some friends have TR2's of varying wattages, They're not too expensive and all of ours have been fine. I personally have the 600W. I haven't see andthing about them being defective at all.