New or Used Grizzly, 700 or 550?

Just purchased a 2014 700 EPS and had it out on Burning Rock in WV. Trails were great and grizzly did superb. Now I am looking for another. Son soon to be 16 and wife thinks it would be good if we had 2. I was looking for a used rig, but anything decent is close to a new one. Was thinking about other brands, but keep coming back to Yamaha as being best for me. Just got a quote for a 2015. Very close to what I paid for my 2014 4 months ago. MY question is for beginners and intermediates I was thinking of a 550, but keep coming back to another 700 and possible use the speed limiter until Jr gets better on the ATV. Has anyone used the speed limiter? And I think somewhere along the way my daughters will want to ride too. Anyone have similar experience? Will mostly ride in WV and some in PA. Thanks in advance – Kevin