RE: When is it okay to go bigger?
And Paully, the main thing about flying a bigger plane is to not let them psyche you out. If you're afraid of it, you'll do something stupid. But if your approaches and landings are good with your Pulse XT40 (the best 40 plane I've ever flown, I love it!). Big planes just take up more sky and make your knees knock because your wallet is afraid of crashing. Get a good set-up, build it well, have an experienced guy help you with the motor AND look it over, and do frequent preventative maintenance. Do those simple steps and you'll be just dandy. Just...dont' be afraid of the big ones. Remember, they're still just R/C planes....the same sticks control the same things, this one is just bigger.
Do you have any plans for a set-up? A good set-up is your first step towards success
Edit: I totally agree with Eganwp, there's no reason to go 25-28%. They're about the same price and don't fly nearly as well.