Isn't technology wonderful? There are so many options available now for us to use.
Threads like this without focus tend to end up discussing the esoteric or trivial distinctions, IMO. To iPad or not? To Kindle or not? Well, personally - and it's clear I'm not alone - I have both. I decided on focusing on the Amazon store for books and read using the Kindle software on my iPad when I'm home or on a plane, and use my Kindle (previous gen version with keyboard) when I'm on a beach or by a pool (and on my phone when in a line at some government agency waiting forever...). The Kindle software is good, but not great, and gets the job done.
The iPad shines with it's versatility. Since money is no object, I'll agree with others that the iPad wins hands down. Yes, the Fire is a nice device, though I'm personally waiting to see their next version. Dedicated eReaders other than Amazon's just don't do it for me, the Nook included.
I'll also agree with others that you should wait a month or so to see if Apple announces a new iPad version. If they follow past years, the new iPad will be announced and shipping soon... At which point I'll have an iPad 2 for sale!
On a lighter note, the best use of my iPad is reading and responding to TUG when I'm out and about using my unlimited AT&T connection (which unfortunately they don't offer anymore). Ever since I bought my first iPad I don't think I've checked TUG on my computer more than a handful of times. The versatility of the iPad is what makes it a fantastic device.