Use this to calculate your sand bed. http://www.fantasyreef.com/flash/calculator.html
Decided how deep ya want it?
Never was a big fan of wet bags of "live" sand. I hear it can speed up a cycle process, but I think it's more expensive. Dry, aragonite based sand, but rinse well. I did mine in a rubbermaid tub and an outdoor water hose.
That link looks real interesting with the seeded sand and all. Never had an experience doing it that way. Just wondering how all that life you'll put in there might fare with high ammonia during the cycling. Or maybe it'll help it and with water changes during the cycle - thereby maybe extending it some you'll still do well. As you can see, I can't tell you anything about that route definitively, but it does sound interesting.
Someone'll be along shortly I'll betcha.
Another thing though, if you plan on using cured rock, you might be able to get it cycled really quickly - or maybe not even have big ammonia spikes in order to get it settled.
Cured or uncured rock in your plans?