Looking on Midway, all I see is the standard of Redding dies for for $155 and a type S bushing neck die in the 7mm Dakota for $135. They do make a type S FL die and a body die, but not a competiton seater and the body or FL sizer would have to be ordered from Redding and they charge more than Midway.
I personaly am a bushing and competiton bullet seater fan, so if I was going with either the Dakota or the 375 Ruger, I would be getting custom dies made. One of our members mentioned a guy who works for Hornady who will make a set custom dies for a couple of hundred dollars. So for me, dies for either the Dakota or the 375 Ruger would cost the same. The brass for the 375 Ruger costs $.82 ea and the Dakota $1.63 ea in 100 case lots. 200 peices of brass would be about $160 in difference and Hornady is probably as good or maybe better (?) than Norma as far as durability.
Then there's the reamer. A smith is more likely to have the Dakota and new reamer would cost a couple of hundred or more... but it could probably be easily sold right here in this forum or even rented and you would have the reamer for another barrel if and when needed. I'm not a smithing expert but I was under the impression that a chamber reamer can be used separate from the troat reamer. If so, I dont imagine it would be too hard too come up with a 375 Chamber reamer and a 7mm throat reamer separately.
Another thing about the 375 Ruger is that it will the standard magnum bolt face whereas a Dakota will probably require the face to be opened up a little. No biggy but something to consider and once the bolt face is opened up it probably wont be useful on another standard magnum cartridge.
Just thought I would make your life a little more complicated