2nd Monitor...or not?

So here's the deal, my computer can easily handle 4-5 instances of WoW simultaneously. So power isn't a problem.

Right now, I'm running a single 19" Widescreen monitor with 3 accounts (i do a 2/3 Main, and split the other 1/3 for the other 2 boxes). I just got an extra infusion of cash that I wasn't expecting and I was trying to decide if I wanna get a 22" for my main and split my alts onto the 2nd monitor. Positioning on my desk will be a little tight but I could buy a stand to put behind the main monitor and set the 2nd up on it.

Any advice on whether a 2nd monitor would be worth the work/money?

I only connected a second monitor out of curiosity (I had one lying around), but now there's no way I'd go back to a single one. It's so useful! Not only for multi-boxing, but for other things too.

If you have the physical space, I'd recommend it.