IMO, you may be trying to do too much with travel from/to Maine, Disney, Universal, Sea World, shopping, cruise, and wedding all at the same time. You're talking about a lot of stress.
Personally, I'd trim the trip down to Disney and one day at either Universal or Seaworld.
If you're big shoppers then have fun at the outlets. Personally, I would shop for my cruise clothes ahead of time back home -- hit the malls and the internet and you'll get clothes at prices just as good as the florida outlets that cater to the tourists. You'll want lots of slacks and shorts -- I buy us lots of Dockers for our cruises. Since you'll only wear the slacks for dinner, you can get by with wearing the same pair a couple times. You don't want denim jeans -- much too hot in the caribbean. Also, you'll need some decent t-shirts and casual dress shirts (blouses for your fiance) -- I usually load up on them at Old Navy or Eddie Bauer. You'll want a suit with two shirts/ties to wear for formal night (two semi-formal/formal dresses for your fiance) and a jacket/tie/dress shirt combo for semi-formal night.
You don't say if you're planning to drive or fly, but if you're driving, I'd pack the bags for the parks (more casual clothes) and then repack them the day before the cruise, leaving all of your heavier and more casual clothes in your car at the dock. Hint: There are washers/dryers at WDW, but may not be any on your ship.
Your ticket prices sound a bit high. If you have a tight budget, skip the non-expiring ticket and go with one that expires. Also, only buy the ticket for the number of days you'll be going on THIS trip. For you, the Magic My Way with Park Hopping is probably the best option for Disney World. Also, you may find that it would be cheaper to go to Disney for 5 days, Universal for 2 and save Seaworld for another visit. If you don't plan to use the extras like the water parks, Pleasure Island, etc. much then don't have them added to the ticket either -- you could always pay for the ticket at Pleasure Island for one night separately.
The trick to all of the planning, I think, is to realize that this is not going to be your only trip you ever take to Disney World/Orlando. Having fun and relaxing with each other is more important than seeing/doing absolutely everything.
There are sometimes
AAA discounts for Universal and SeaWorld tickets, I think. Also, if you're planning on staying at a Disney World hotel, ask for the AAA rate -- you don't have to have the card when you make the reservation, just for check in. In my experience, getting the AAA rate more than pays for the card. (Saved me $175 for 7 nights on my upcoming WDW trip. And only costs $56 for the card.)
I hope this helps!
EthansMom