What's better for elk .308 or 30-06?

I'm a newbie and am looking at savage rifles. They sell them with scopes, since I'm new I don't need a fancy expensive scope yet plus I don't have the money. I found a rem 700. W/ bushnell scope for $480 its a 30-06. I know that really good but can I get a .308 and isn't it cheaper for .308? I only have $350-400 to spend. What do I do how can I get a decent rifle for now on my budget and being a newbie to hunt elk? Help?