The rs80 wheels that are in the price range he's looking at are the RS80-C24 which are 24mm rims, not the more expensive 50mm deep section version.
Deeper rims will always be heavier, but give better aerodynamics. You need to find something that suits what you're riding. If you're doing a flat TT, the aerodynamics are more important and you'd be better of with a disc wheel on the back and a big rim on the front. If you're going to be doing a lot of climbing, the weight is more important. Most people will want to find something in the middle (especially us fatties who are over the weight limit for most lightweight 20mm rims

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RS80 wheels have an alloy brake track because they are clinchers.