I have not studied in depth the latest available 10" tablets so there may be others out there that are worthy. I have the first Asus 10" EEE transformer tab with detachable keyboard (Asus are masters at using long names). It is an excellent pad, although a bit dated now, not in capabilities but in processor speed only. It has two USB ports (one in the keyboard), an SD slot, a Micro SD slot, an HDMI port, a headphone connection, two cameras and a built in microphone. Most good Tabs should also have the same, some do not.
I would recommend any of the Samsung or Asus Android tabs. I would stay away from Windows and Sony pads for the time being, especially windows 8 (I have a windows 8 computer, so I know!). Apple is too easily broken and is way too proprietary. The cheaper pads (no name brands) can be good but I believe you generally get what you pay for. My wife has a Pandigital 9" and it is useless. (That may be because I rooted it)
If the tablet has a USB port, as most good ones should, you connect the tab to your computer and the tab should show up as a device. You simply transfer your photos to the photo directory in the tab. You can do the same if the tab has a Micro SD or standard SD slot (I have not used a reader but that should work also). They work just like a second computer, if you can do it between computers, you can also do it from your computer to your pad and back. Due to the pad not having endless amounts of memory you should resize your photos to match the maximum resolution of your pad. Using photos straight from your Sony camera may be a problem. I shoot Raw + jpg and each double file can be over 30MB.
Book reading on a 10" tab is fantastic (two pages per screen) and emails, forums and light browsing are no problem, if you have wireless access
. They are not designed to be smart-phones.