Yeah we want to go as long as possible. With some sort of dining. And the best hotel
March is considered peak season. It's one of the most expensive times to go. Holiday (week before Christmas- weekend after New Years & week before Easter and week after Easter) are the most expensive. Disney has 3 categories or their hotels Value, Moderate, and Deluxe. Value are the least expensive if they offer a discount you should be able to get it for about $125 a night. Mod will run $200+ and Deluxe will run $300+++ a night.
A 3 day base ticket will run about $260 a 10 day is $319 (new prices) this is a non hopper. Meaning 1 park per day, to add park hopping you are looking at $60 per ticket.
Personally I won't do the dining plan. I think it's a waste of money. It's cheaper to pay out right.
Quick service is 2 counter service meals (entree drink desert) 1 snack and 1 refillable mug is currently $38 a day (might increase for 2014) regular dining plan is 1 sit down restaurant (you pay the tip) and 1 counter service, 1 snack and 1 refillable mug is $57 a day (you are going during peak season)
I find it a waste because we don't get dessert typically. Plus the ones they offer with CS aren't all that. I'd rather save the money and buy something better later. Mugs in my opinion are also a waste. They are only good at your resort, when my girls were teenagers we'd get them but they'd always get sodas from our cooler, they didn't want to walk to the soda station (with ice mug holds about 12 oz of soda).
We live close enough to drive so we stop by the store to buy chips, bananas, peanut butter, bread, apple slices, caramel, carrots, ranch, sodas and water. Even without a car it's worth a cab ride if you going for at least 5 days. It's enough to act as a small meal and saves money on snacks.
I suggest visiting allearsnet it's a great site that has menus for Disney restaurants and info & pics of the hotels. Give you a better idea where to eat how much it'll cost and see the rooms.
My girls are now 20 something and they prefer the values saying they go to Disney for the parks. They'd rather save the money on hotels to go more often.