I have the original iPad & an iPad 2, both with 3G. No matter what "i " you get I'd recommend the 3 or 4G option for the GPS capability.
What's your question regarding them.
I don't know that the kindle or other mousetraps have 3/4G capability but you won't have the Nav apps you have available from Apple.
-.02
Once you find your "reason" [not that you necessarily need one, but they are ALOT of $$] you will wonder either how you did without it - or find excuses to use it. Or, like me, just use it.
eg: My recent road trip to Marathon. Aside from all the browsing and buying I did on my i2 before the trip. & how easy it is to use on the boat while shopping for mod parts or browsing mod ideas and seeing if they'd work for you. There was the browsing, music playing, picture/ movie taking - find the next place to eat [Cracker Barrel] gas station; blow up of the next three exits in map view or Tom Tom or whatever other navigator you buy as an App - which will also then appear on all of your other "i"Things [ I have 4]
I also took pictures of everything from my steering system that broke on the trip. To crying about it to you guys while zooming down the highway - while my buddy was driving - of course.
& lets not forget the water apps... WOW
It's a portable Chartplotter - Provided you have 3/4G.
I have: iNavX [which I use the most]. Navionics US East Coast [Also on my iPhones] & my new favorite Charts&Tides because it works with Active Capt and gave a lot of useful information while in unfamiliar waters
Re iPad - U Can't beat it. Insure it, be careful with it. If It broke today - I'd have another one by tomorrow. That useful to me...
It was my road atlas, water atlas, Radar for coming inclimate weather; picture taker, star gazer, chronicler, time waster

web surfer, in short most useful tool & toy u can get
Get One - At least the iPad 2 [You'll use the camera] or the New iPad 3/4G. Min of 16GB but get the 32 if you can afford it. & if you don't like it you can always give it to someone who'll use it

P.S.
Both of mine are 64GB - No regrets. & when the smoke clears, they're $1300. Don't kid yourself. Between tax and insurance and a nice cover $1300 not $899. So put on ur Big Boy Pants...
& Embrace the terror
