Check on the wheels thing with your shop. A nice, handbuilt wheelset can cost anywhere between $600-$1000. An equivalent nice factory built wheelset probably north of $1000. The Crux E5 stock wheelsets are DT Swiss Axis 2.0 and they weigh 2.1kg. Check how much they will charge you for those (they can be found in ebay for less than $250, 'new bike take off'. If you tinker with the wheelbuilder.com custom wheel screens, you can get a sense of how much a custom wheelset would cost you (presumably your bike shop could make them for less) and how much they would weigh. I was never a believer in custom wheels, but the women in this forum changed my mind.