Suggestion based on your experience

Hello,
I’d like to get started with my first project using Arduino and I’m needing your kindly advice on best hardware to use to accomplish my goal.
I’m trying to build up a tiny barcode reader (as tiny as possible as dimensions)
I would need a arduino board (accepting some rechargable battery logic) supporting
– wifi connection wit HTTP stack communications (for doing some GET/POST etc)
– a RS232 port for reading barcode scanner output (or any sort of UART to communicate with the barcode readed)
– a simple text character LCD display to show some text (I think a 2 line LCD would be enough) or as alternative a little graphic rectangular LCD
– a barcode reader, with a camera (something like this, don’t know if it is the best choice).
Based on your experience, what hardware would you use for such project.
Maybe for prototyping there is no real need to have tiny dimensions but at a later time I would like to have a very handy and tuny reader.
 
Thanks!