Nice stones you picked there. I would skip the sand path idea if it was my tank, just becomes a mess and is overdone imo. If you want to do ug and hc you could go with ug on the sides and back and hc in the middle for your "path".
You've done the sand path before? Does it require a lot of maintenance?
I bought this tank just to do a sand theme :P
Maybe if I don't use too white sand? Maybe white mixed with black to create a gray look so it wont be too bad if it mixes a little with the aquasoil.
The HC path is also a good idea. I'll have to think about this one some more.