I second the thoughts on checking with the landlord, or at least the lease. Also on checking if that wall is a load bearing wall or not. Something something tanks crashing through apartments like that one children's book where the kid jumps on his bed and destroys 10 floors or something.
Whatever you choose, make sure that you've already premeasured out how far the tank will stick out. 2' doesn't seem like a lot...until you actually measure it out and "oh whoops, that's actually a sizable distance".
If you go with glass, then starphire might be up your alley since you have oh so much money to spend. Acrylic is also nice, but you do have to be more careful as well.
Flexibility: I know a lot of people have said "4'x2'x2'", but if you're going reef...you might as well go big with a 180 (6'x2'x2') tank, since that can house most of the fish that you could conceive of (except sharks and stingrays and some of the larger tangs). Join a reef forum or something (and say hi to me on Reef2Reef!) for more information.
Ease of purchase/Installation: For any tank that's larger than 55, you'll have to go to the aquarium companies. 55s at least come with the kits from walmart (which are surprisingly decent). I've heard good things about Waterbox and RedSea, but haven't purchased them yet, since I'm not a big tank kinda guy.
Sump: Yes leaks can happen. But most of this is due to bad plumbing. Read up on how plumbing in a tank works (saltwater forums are great at explaining this), and using PVC, and cement, and silicone, and unions. I built my parent's 55 reef, and the only spillage that's occurred is from water changes. And yes that included the plumbing. Keep in mind that if decide to do drill the tank, that you don't use tempered glass. I would say that a sump is invaluable for a saltwater tank though, since there's a fair amount of unsightly/bulky life support equipment, and it increases water volume.
Peninsula: The only decision here, is yours. There are some very aesthetic peninsula tanks, but remember that if you drill the tank, it will forever have to be a peninsula tank, unless you choose to buy a HOB overflow and return.
Are you crazy? Maybe. But most fishkeepers tend to have a few quirks here and there. I would, however, sleep on the idea for a few weeks and plan everything out before making the first purchase, just so I could rest easy knowing "ok, I knew the price going in, and all the variables and stuff." and sleep easy knowing that yes, I did spend that much money.
So many fish/plants/inverts to keep, not enough aquaria.