If you have the bucks I'd go for the DY, you're getting a guitar of similar/slightly higher quality to the 550, but also getting a guitar that will hold a slightly better resale value than the 550, it also has better pups, pyramids and all the usual Jem routs, i.e. Monkey, Claw (which are not important to me to be honest ) and if you don't like DY then you are an odd fellow....didn't you know revolting colours are back in trend

j/k
Seriously, I'd go for the DY, but if money is an issue grab the 550.
Steve
P.S. The 30 ain't a bad machine if you can have it cheap.