I'm really indecisive about where I'm headed next, I have so many wants it's hard to settle on one thing.
I'd like to do something smaller as a personal item..I was thinking about maybe a styrene based Pelican with lights, engines and RC wings. I also want to try to do a cast of my helmet..not really for any other reason than to try my hand at casting..so maybe get two or three pulls from a cheap homemade mold. But mostly I want to switch to foam and also take a step away from Halo. Halo (up to 3) was a massively cool thing..now I feel it's been ruined by 343i. I know a lot of people will disagree, but that's just my pov.
An easily accessible build (due to other builders and file availability) is War Machine (Iron Man 2 movie style). I'm very tempted to have a go at that.
The only other things that have caught my attention is Destiny (duh), Titanfall (a scaled down Titan would be awesome) and a few odd props here and there, but I don't really like making props (don't have the talent) so I'll stick with armour/suits for now.