We went last Oct half term, Virgin just got more and more expensive nearer it got, ended up at £800pp. I ended up booking with NWA from Heathow via Detroit £240pp. Best decision I ever made, their service knocked spots off Virgins, unfortunatly since then NWA have merged with Delta so no idea how its affected their routes.
We don't mind indirect at all, get immigration done at 1st airport makes it easier on arrival at MCO.
For this Oct USairways are £343 from Gatwick to either MCO or Tampa flying friday or Saturday, If you can go Thursday 22nd it brings cost down slightly to £328, I would fly indirect anyday to save £200+pp others wouldn't.