MR's hold there value better as there were less made. But if you want to mod I would say go for a 260 as it's the best base model to mod from.
Just do your research very well as good ones are getting very hard to find. I did know of a very nice tme that wasn't allowed to be sold on only kept by the current owner or scrapped as a few years after it being imported it has come to light that it was a ringer from japan.