I don't have much advice on stands, but making sure you know the underlying cause of the last leak might be a good idea....is the floor uneven or sagging under the weight of the tank? Best to remedy any other problems or you're likely to have a repeat performance with a tank that size.
I have 2 96 watt PC
kits from AH supply and they are great. I have them in a modified wood canopy. The kits are easy to put together with some simple tools and the reflectors are great, there was a visible difference in the brightness of my tank with the old and new lights (same wattage, different reflectors)