Wheel upgrade

Kingsmill1 Posts: 103
edited December 2012 in Road beginners
I currently have a 2013 allez sport fitted with the standard wheels, I'm looking to upgrade the wheels as most say it's the best and cheapest way to improve my bike. I know nothing about wheels but looking to spend around £400 and keep my rear sora sprockets, ideally I want something lighter and something with a better race performance , I currently do around 60 miles per week mainly for fitness. Any suggestions would be greatly appreciated.
Giant TCR Comp 2
Specialized Allez Sport