i no longer have any ibanez. were i to get another, i would look long and hard at an as73. all of the up-market ones-near $1,000 in price-have no real advantage over the as73, imo. that said, they are a bit flashier, supposedly have 'better pickups'...but having played a few, it depends on your amp and your fingers as to what you will prefer.
the vikings have a bit saucier tone, all other things equal, and have a bit flashier headstock. i think from time to time about selling my viking, then i play and think, 'heck, no.'
'used' guitars have been good to me. guitar center has a number of used as 73s. i did not check vikings, but they likely have some of those as well. hagstrom has an 'i-beam' in the neck-my hag doesn't have any neck problems, whereas, a number of other guitars with 'solid' necks i have had have had a little warping, bowing, constant truss rod adjustment needs. all depends on what you like and will tolerate. nothing is perfect, i think...although some will say 'such and such guitar is perfect'. ha. hahaha. maybe 'perfect' for them...or they got paid by someone to say so.
http://www.guitarcenter.com/Search/Default.aspx?internal=1&browser=&fsrc=ibanez+as73&src=ibanez+as73