Unless cost is the driving force, I would go for the 10' tank. Visually a tank that is bigger front to back isn't nearly as impressive as one that is longer. I get that moving the tank can be a challenge, but you'll have it done in a day, then enjoy the tank for years to come. Get what you really want and figure out the logistics. 3 or 5 years from now, you'll never regret the work you put into your dream tank setup. You will regret compromising on something you didn't really want.