I'm due for an oil change, previously I was just going to the dealer and it was something like $40 or $45 but it was whatever oil they put in, I didn't even think to ask. I know some people may be proponents of Synthetic and others stick to regular oil (well it's definitely cheaper).

I am thinking about going synthetic myself, I never have but know some people who have and swear by it.

My question then is, how to choose which oil to get?