I need to get new tires on Monday and was wondering what size everyone would suggest going with. Either one of the following:

265/70r15
30 X 9.5R15
31 X 10.50R15 LT

I saw the pics posted at http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=37;t=001670;p=2 an they look good, but I was wondering how 31" tires would look. Does anybody have any pics of 31X10.50 R15 Duelers on an X?

I do a lot of offroading but it is mostly at the beach and not on dirt/mud. Would going with the 31" tires make a big difference with noise/gas mileage?