the best price I found on the 320 is sears on line , they had it for 450 with one dc40 collar , 150 dollars cheaper than most places , my buddy had a 320 and I had a 220 , he loaded my dogs in his and when I lost them on the 220 he would pick them up a lot sooner than I would as we went to the last place they where so I upgraded to the 320
I have a 220 as well and a buddy of mine had a 320 when he lost his dogs I was still picking them up on the 220 at 1.02 miles I guess it just depends