For a tank this large, I would not use a
hob. Instead, I would use 2 canister filters. It will evenly filter the water without dead areas. What are the dimensions of the tank? I have a 150 Tall and use 2 Cascade canisters.
Also, when determining the size of filters to choose, you'll want the combined total filtration to be about 600 to 700
gph. Do not rely on the manufacturers rating for how large of a tank that it can filter. They fib a little and tend to overestimate. If it were me, I would go with the XP2 and an XP3. Or maybe two XP3's. If it is a standard 150, I would go with two of the XP3's.
You could also use a sump. But I would definately stay away from hobs on a tank this size. If you're spending all of the money to setup the tank, I wouldn't want to have the filter showing. With a canister its all hidden under the tank.