In my checking, I found the Tri-Tronics and Dogtra were both top of the line collars. Being a hunter and $$$ being a factor, I bought Dogtra.
I got my Dogtra 1200NC for $275.00 shipped right to my house, from Creamlevel Creek Kennels, and the cheapest I could find them at Gun Dog Supply, Lion Country or anywhere else was $299.00.
Cooter told me that he trains with a Tri-Tronics Pro-500, but for a Hunter/Trainer it was hard to justify the more money, for the Tri-Tronics. Also said that he didn't think that the page was worth the extra $50 when training retrievers, so I got the Dogtra 1200NC, and should be starting Collar Conditioning in a couple weeks.