I considered the 300 but have been reluctant due to the 1/3 CMOS chips with the use of fast moving sports. I attempted to rent one, but havent found a dealer in the area who has one. Most said they had no plans to offer it. I did use the 170 last fall and it is a nice camera, lens is a bit short. The LCD/viewfinder was difficuilt to pick up the ball as it apeared as a speck. I would have to get a outboard screen in that case.