I don't think I'd ever transfer everything to one account, but then again, I pretty much have alts of everything on my main account, and just a few RAF levels will bring them all to 60 and up. I'm kindof an altaholic who's been playing on Azuremyst since I started.

I'll probably not buy WotLK for all my accounts right away, just my main and my secondary, so I can dual box healers or a little dps with my usual solo-played toons to level them to 80. Frankly, I'll probably still have plenty to do leveling my teams from 60-70, so the extra 3 accounts won't get the xpac till probably after Christmas. I might even suspend those accounts for a few months till I get my mains to 80 and settled.

Personal advice, you've already spent so much starting 5 accounts, you'll spend a lot on the xpacs, you'll spend even more transfering. 65 or 75 a month really isn't that much compared to all that you'll spend transfering, and the costs for all the boxes. Personal opinion, choose which toons you like playing the most, transfer them to the same account if you want, but leave at least one 70 or 80 on every account, so if the mood strikes, you can swipe some cards, and start up the 'ol 5 box again whenever you feel like it. so $15-30 for a few months, $75 for a month or two, then back to $15 or whatever if you get money crunched or bored with it.