inless you have cutouts or serious deep convace with partial wheel wells then i would stay under 72mm. If you get your board too high then it gets too hard to pump since your leg is too far bent and just a little bit of difference makes your leg sore after a while. Also a lower center of gravity is better for carving and high is pretty much good for nothing. here is a really good site that I always go to for help, it is like the NS of longboarding and it will have something to help you, it has a ton of reviews on wheels and a million threads on wheels.
http://www.silverfishlongboarding.com/