please help me

theres so many to choose from

i want something that is light weight, and i would like something with flat spokes for around $300 - 500

i was looking at the:
Mavic Ksyrium SL which i like, but might be out of my price range
Formula Xero XR-1 Wheelset which are really cheap and aero and light, but im not sure about the quality
Williams System 30 which had good reviews at roadbikereview.com but seems kinda unknown
Neuvation M28 which also had good reviews, but i read that they are pretty much the same thing as the forte titan sold at performance for a much cheaper price
and something from easton either EA 50, EA 70, or vista

can anyone tell me which will get me the most bang for my buck? or is there any other wheelsets that are worth getting for around my price range?