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That's my issue now with my current tank, I have a 90 with standard AGA stand and there's no way to get the sump out with out removing the tank first. I did see on Melev's Reef he showed how to do this it's here(halfway down the page) also he showed a second way with the second link>>>...
If you go with a 120 try
Aquarium Discount Pet Center
140 Route 73 N
Marlton, NJ 08053
(856)985-1701
You'll find their prices to be less than Aquarium Centers
You also might want to check with Ed at I.L.C. as he'll give you a NJRC discount and all these stores are within 20 minutes of each...
I really think a 90g would work well, it's only 4 inches taller than a 75 and if you decide to go with a dsb you'll be happy you have that extra room for all the great corals you'll be filling it up with :) I also agree with the others that a 55 is just not wide enough.... By the way ;D...