I was in the same boat as you. I have two lines and the upgrades on them stagger. I have too many Android phones, won't touch iOS, but I wanted to get another Windows phone. Last one I had was the Blackjack, back in 2007? I've been lurking for a while, and since I am on AT&T, I decided I would just go for it, even if I didn't like the phone right away I would wait it out, because sooner or later it'll grow on you.
On Android I became a big flash-o-holic, but I guess it's just boredom that lead me to flash a new driver everyday - I wanted to get rid of that.
I bought the 1520 Thursday night, right when I got home I installed DP 8.1, and started to fall in love with the phone and OS. Initially, I wanted to wait for the green one to come out, but eh, I CBF waiting. Glad I didn't, the red is a nice change after having nothing but black phones.
There are only three things that bug me, though they bug me, they still in no way make me want to return the phone. The reasons are the hard drive size without a MicroSD (still waiting for mine to arrive), and the size of the phone. I don't have small hands, but I still think that it's big. Finally, The shutter speed is so damn slow.
I would get it, well I did get it, but I think you should. The longer you wait, the longer you might as well wait for a new phone to be released. Just my 2 cents and I hope it helps you. The phone is a beast.