You're realistically looking at a budget of $1500 - $2000 and some for a big tank, stand, sump and all plumbing / fitout. I figure it'll be $600 for a tank from greg (if he's got the glass), $500-$800 for the stand (if custom made / steel), $250 for sump tank, $500 for pump + media, plumbing, heaters etc.
If money isn't an issue then the aro was a great purchase. If those numbers scare you then you might want to give it a miss.