First, don't take this the wrong way but learn to spin. Better on the knees, secondly what kind of wheel set do you currently have. Rim and hub, pictures. You just may need to get it trued.
Unless you just want a new wheel set that is.
I also wouldn't recommend going to a higher gear inch for street use. Again the knees part is a factor.

velomine.com has a good selection of wheelsets if you just want to upgrade.
It will help to know your current setup to offer advice on wheelsets though.