with all due respect, if you are unsure of how to select wheels for your bike, it's unlikely that you are going to notice the difference between the wheels you have and a lighter set, except for when you're physically lifting your bike (maybe, you might not even notice then)
Save your money, enjoy your bike as it is or maybe go back to where you bought it and see if it's too late to buy a bike with a carbon frame or Ultegra/Dura-Ace instead of your F75.