id book a room at a value resort. ASSp, ASMu, ASMo tend to be a little cheaper than Pop and AoA-LM. Theres not likely to be discounts at March break time, but you could try!
Skip the dining plan and just pay out of pocket for what you want (so you dont end up paying for a dessert with every meal etc). Pretty much every dining plan comparison thats ever been run shows that its just about a break even, so its more like pre paying for food than actually saving money on food. Especially if youre not big foodies.
Dont get park hoppers, just do one park per day.
We've done the above several times to save money and it works out fine!