What do you use now?
This is why I opted for Android over an iPhone. Drag and drop, baby, drag and drop...
Im on Android. I choose the Pantech Flex last year because I was paying cash for the phone. It was able to do the things I wanted out of the box so I got it instead of the GS3 or other high end phones. It does what I need for now. Im going to wait to see what comes out later. I may even get a Nexus 4 seeing they are so cheap reasons I choose the Flex. Changable battery, SD card, flash player out of the box, drag and drop of files to computer, played a large number of file formats out of the box like midi and wmv. I must admit Apple is still smoother but I like having the options above over what Apple is offering.
Id really like to see a new phone that has true multitasking though. I see there are a few that try. I cant play music from one browser window while using another window but there may be a browser app capable of that. True multitasking would also be something like using your camera app while browsing the web.
For a phone, it's better having more features out of the box than to have to keep adding accessories for certain functions. Would be kinda cool if we could switch out certain things on the phone. If I could say switch from a 8MP camera to a 12MP.
I went to ATT over the weekend and I see that the cash price of the GS3 has dropped about $100 because the GS4 is out. I am also considering the idea of a flagship smartphone because there are so many accessories. I would not mind having an extended battery in my phone or either an extended battery case for it. I can only find external items for this currently. I get about a day out of it with moderate use but I wouldnt mind more. The big screen phones are also sounding better because it's easy to view pdf files and word documents on them.