What DS should I buy?

My DS lite's still works okay but the hinge is broken and it won't stay open/closed properly. I want to buy either a DS lite or a DSi. I'll still have my old one and I have an SP so the whole GBA slot thing won't be an issue. I don't think an upgrade would be necessary but I REALLY like the color of the Blue DSi. So I guess my issue is that I don't know if I should buy the slightly more expensive DSi with the cooler color or the slightly less cooler colored but cheaper DS Lite. Thank you!