i have waxed mine today...first time i have used a wax.  polised it with autoglym super resin polish > poorboys white diamond glaze > autoglym extra gloss protection > collinite 476s.  i think putting the wax over a sealant will only benefit the car...i am going on things i have read, only time will tell.  i could see a difference, the paint work seemed deeper and generally shinier.  however, after 4 1/2 hours doing all that my Mrs comes out and says it looks no different to when i started!  

anyway, here's a before and after...difficult to see in pics i guess but i am happy with it.  in a nutshell, i can see the wax will protect the paint and make it look better for longer and i shall definately do it again.
before

after
