Road Wheels & Road Wheel Recommendations?

If you're 80kg use the cheap, heavy wheels, lose 2kg of body weight and boom you've saved money and broken even in weight terms

Surely you'll have saved weight unless the lightweight wheel option is in fact weightless. To break even you just need to lose the difference in weight between the wheelsets, which is unlikely to be more than about 600g. Somewhere between a haircut and a really big poo.