I reserved the run-of-the-mill standard edition. 
I would in all probability look at the artbook a grand total of once, and the soundtrack is nothing I'd want to rock in my car, from what we've heard so far, anyway; so the only thing that draws me to the limited edition is the better cover, which isn't worth an extra $20 to me.
At least I'll get a free t shirt since I did it through Gamestop.