I'm totally new to tabs but now I have a need to find a suitable one. I've spent hours looking at all of the different brands on the market but still non the wiser. OK here's the deal... main purpose will be as an in car sat nav system (hope to connect audio with the cars stereo maybe) it will double as a wifi based web browser so the functions I'm looking for are; GPS, USB port/ports Bluetooth (connect with my bluetooth obd) Wifi HDMI Android based (preferably easily upgraded as and when needed) and a 7 inch screen I don't want a sim based tab as I have no need for it. I'm happy to buy a second hand tab and power wise I'm not too fused. Must be under 100 pounds. What would you guys suggest ?