I'm tempted to say, "Get the Axe," but what you're describing as far as what you want/need, just get a POG pedal for basic synth tones, or if you're wanting to play other simulated instruments on your guitar guitar modeling, etc, then yeah, buy the GR55- smaller, cheaper, tiny learning curve, and no need for separate floor controller. That's your buck right there.
Axe Fx 2 is for the guy who has already been through all the stages of guitarist life, from analog to digital to tube + million pedals and back, and still dissatisfied and disillusioned with it all, for various reasons (weight, cost, maintainence, crappy tone, etc).
It is the Cuban of cigars, the 75-year-old glorious red wine, 30-year-old scotch whiskey, the $2200 block of aged cheese, the 14-hour mesquite-smoked brisket, the H&K of firearms, the McClaren F1 made of gold titanium alloy, the Colossus of Clout, the Sultan of Swat, the King of Crash.....the great bambino!