many think of the frame and the equipment and the wheels are part of the equipment. as Bob D has pointed out, the wheels are something you can take with you to a new bike. with that said, you should not limit the amount you spend on wheels thinking that you only spent x for the bike. the key is not the cost but the weight of the rim. the weight of the rims will count twice as much as weight on the bike. weight of the hubs are rotating weight but the weight of the rims are like a lever. it requires a lot of power to turn the weight of heavy rim. even with aero rims, light rims are still important, when you stand on light rims, you will fly!

many lbs will let you test ride wheels check with yours.