I would definitely go with a Seasonal Pass. Its $215 for the seasonal and $140 for the 3 day with hopping. Unless you are going during blackout days. For the $75 you can have many more weekends away. During 2005 we went 8 times(25 days). As soon as Wilma blew through we were Disney bound. It was nice knowing we were going to have hot food, hot showers, and electricity. Plus I didn't have to pay for tickets because we already had our SPs. Plus having a SP allows you to book under the Best Rate program and the sit down lunch discounts 10% off (not good for dinner but you can get the DDE card for $60 for 20% off) select restaurants at Downtown Disney, Epcot's World Showcase, and some Deluxe resorts restaurants (ESPN Club, Concourse Steakhouse, Kona Cafe, and Whispering Canyon to name a few). These are for lunch.
I am glad they brought down the cost of adding park-hopping. last year I wasn't sure I wanted to buy a SP but the 3 day w/park hopping was going to be about $165 so I went ahead and bought the SP as you can see I used it well. We've been SP holders for the past 6 years.