Hi there, I am a hyper realism portrait artist needing to buy a tablet for viewing HQ photos to paint from. The tablet needs to hold thousands of photos, show great detail and accurate natural colours, and have a bright and non reflective screen for use in a sunny art studio. The bigger the screen the better. I would like to spend as little as I have to (say under $400), but if this isn't going to get me what I need then I'm willing to pay more. Also an expandable memory would be great if possible. Are Ipads and Galaxy tabs the best of the best or are there others who have better screens for what I'm wanting it for? I'm not great with tech talk so I'm sorry if I describe things the wrong way! Thank you so much for your time and help!