Really you are very limited on finding tanks out there.
I personally wouldn't buy a tank from a lot of the companies out there that have cheaper tanks. Just look at places like glasscages warranty and their records.
My opinon is go with the companies that have been around a long time, make good tanks and have good warranties. Like Oceanic, All-Glass, perfecto.
Now if your boss wants something custom with starphire glass, and lots of holes for custom flow then there are a couple places I can recommend but for a simple 200gallon you are better off going through a LFS and getting a name brand tank.