I have an iMac, Kindle and iPhone and was going through a similar debate. I also have a work laptop, but avoid doing personal stuff on that, so I don't "count" it.
DH got a first generation iPad for work, but can't install any personal stuff on it and honestly, doesn't use it for much outside of web browsing. His employer was overly optimistic about the apps that they could develop internally and never got them to a point of really being usable. So now, he uses a locked-down iPad once in a while. He doesn't see the value in them at all (mostly b/c it's locked down and it really limits the use), so I had a LOT of convincing to do when I wanted to get one.......
I read a lot and have a few magazine subscriptions, plus I have to keep up with the Wall Street Journal for work. The iPad would definitely work with all of these things! We also have Apple TV, so we have a ton of movies/TV shows that could be transferred to it. Finally, DH said that he still didn't really see the value, but was fine if I wanted to get one. I don't normally have to ask "permission" but for such a pricey item, I wouldn't purchase it without discussing with him.
Well, on Tuesday, I placed an order online with a delivery estimate of April 22nd

. Definitely didn't want to wait that long, but the supply seems very limited right now. I had yesterday off of work and stalked an Apple Store and Target in the early hours. I scored exactly the one I wanted (at Target, had an alternative one on reserve at Apple) and am thrilled. I have barely put it down since yesterday. It is incredibly cool. I thought it was just an iTouch on steroids, but it is so much more. While long e-mails aren't ideal, we have a wireless keyboard w/ our iMac and could use that in a pinch. The screen is very nice (even though it's not the retina display of the iPhone 4) and it's just a pleasure to use. While I still prefer my Kindle for long spans of reading, I don't mind reading on the iPad at all.
The one thing that sold my husband.....the March Madness app where he can watch games on the iPad and iPhone. He has it on the iPhone, but it is so much nicer on a big screen.
Sorry for the long post, but I just want to explain that I was in a similar situation and am absolutely THRILLED with it!