I think you answered you own question.
I picked up my iPad 2 on Friday and I already had an existing iPad 1. However, a buddy of mine told me he wanted to buy it. We had it all arranged. Well seems he forgot to pass that buy his wife, who vetoed it. Needless to say here I was sitting with both and needing the money for the iPad 1 to at least buffer some of the cost. So, I strongly considered just keeping the iPad 1 and taking the iPad 2 back.
Then I really started doing some comparisons between them and this iPad 2 it is just better all around for what I do. I do use mine for work, I edit documents, I use QuickOffice, Dropbox, send a lot of email, take notes, use the calendar. I have an iPhone 4 too, but everything is just so much more convenient with the iPad 2. The way apps open so quickly and I can just really push it where as the iPad 1, you just can't without noticeable lag and slow redrawing of the display.
I then said, well all that is nice, but I just can't eat the full cost here. So, I take a chance, place my iPad 1 on eBay. There are so many of these being sold on eBay. I did an auction with a buy now for the max I wanted. Placed the listing and 12 hours later as the luck of the draw would have it. Someone actually bought it at my buy now price of $599.00. I was thrilled and already have my money and just shipped them their iPad 1 today. The iPad 2 gets to stay! Oh yeah!
Just food for thought! Good Luck!