Gloss paint is generally used for the woodwork in a room - doors, frames, skirting boards, windowsills. You need emulsion for the walls. This comes in a variety of finishes, but I tend to lean towards satin, as it has a nice sheen to it.
Pure white can look a little cold, but if the room gets plenty of natural light then it just might work. My best advice to you is to pick up some sample pots of white with a hint of other colours (and maybe get a pure white too, just to try it) and try them out on the walls. Check them out at different times of the day, and you'll probably come to prefer one over all the others.
And remember - it's not that hard to change the colour of a painted wall, if you're not happy with the end result.