There is also the iPod Touch that has almost everything an iPhone does, but is Wi-Fi only and lacks GPS, and the camera isn't as good as the iPhones. 

Having a camera on your PDA device is very useful. Apps such as Evernote let you add images to notes. Don't want to lose that scrap of paper with handwritten note? Snap a picture and save into Evernote. Need to keep a copy of a recipe? Same deal, though I use GeniusScan for this. Need to remember which wire goes where so you can reassemble your thermostat/laptop/electronics correctly? Really darn handy to have a camera in your pocket. I use my phones camera as a scanner almost as often as I do for taking pictures. 

If you're going to go away from the well known manufactures/brands such as Apple, Samsung, Motorola, Asus, Amazon, Barns and Noble, I would do a good amount of research. Can you root the device and install the stock Android OS from Google, are app developers embracing the device or is it a victim of the fractured Android ecosystem? Is there an active community of users around the device?

Sry bout d spln, snt frm my mobl fone.