I'm not familiar with the .260 at all. The .308 is a great cartridge for deer as well as black bear, moose and most anything else you are going to run across in North America. I understand a lot of folks like the .243 and consider it an outstanding deer cartridge.
I would personally pick the .308 for most of the same reasons already given by others. I expect though that all will do the job very well so you should factor in your personal preference and needs to make this decision.

JagMagMan-Why did you stop at .30 caliber? The 45-70 Government is what works best for me considering me and the conditions I hunt in. Think BIG man!<img src=icon_smile_big.gif border=0 align=middle>