You did not mention what type of vehicle this is for. I have a 15" vga lcd in my yukon and it looks right at home. I think it would look a bit silly in a small honda. I also have 5 7" comp LCDs in my truck as well. I have tryed to use the computer on them and i couldnt do it. the fonts were just unreadable. if you are going to use a front end software the smaller screens might be a good choice but if you want to surf the web, email, read documents, or just basicly navigate windows i would get the bigger screen.