So first off - Great discussion and a lot of good info.
I want to step back just a bit and explain why these choices:
1. This is my first PRS build - I am currently shooting a Savage action from Cabelas in a MDT XRS chassis (Not the smoothest, the bolt binds up etc ... but it shoots 1/4 moa groups if I do my part. ) So this was my "budget" regret build
2. I do not need the best of the best. I want to build a decent rifle that I will be happy with. I have tried the origin and nucleus actions and think they are very nice. Nicer then my now sold Tikka (which I thought was really nice)
3. I have 6 kids and single income family. We do great but there are other priorities. For this reason I think the Origin or Nucleus or Tenacity are great "Custom" actions and I will be happy and proud to shoot any them
4. If I can save some money that will go towards good glass without compromising quality then yeah!
5. My son is getting interested to start shooting with me. So this build will most definitely go to him with a barrel swap and bolt face change for .223. After that I will build another rifle with better parts
So now what I would like:
1. A good quality custom action with great support from the manufacturer
2. Rem700 platform (Aftermarket parts .. Simple)
3. Aftermarket Trigger support
4. Pre-fit barrel compatible. Preferably Savage small shank as I have several barrels
5. Easy swap bolt face
In addition, I have the same preferences for the Chassis. Does not have to be the BEST. I am looking at MDT ESS and save myself some money there while still buying a quality product that I personally like
Now to the question of Impact action - They are about $800 CAD more then the origin, nucleus or tenacity. That is a lot more (almost double) then the others that will come in handy in other parts of the build. Do I need to have an Impact. My answer is no. The actions mentioned are all good quality and smooth enough for what I intend. And availability is an issue in Canada. Same with the Tenacity actually
All the savings in the end goes towards components. These things are hungry and needs to be fed regularly. It aint cheap.
The actions I listed are the ones I know and have tried. That is why I said I am open to any suggestions in that price range. I am in no rush but ...