The new Sendero is priced pretty close to what it would cost have one built with the barrel of your choice. I think you could buy a used Sendero and rebarrel it with a really good barrel for $1600ish, a new one will cost you with GST about $1400-$1500
A 700 action, after you sell the stock & barrel from the donor rifle.......$450-$500 for blue, a bit more for stainless..you can get them for less if you can find a used 700 for a good price..parting out a new SPS is one of the quickest and easiest routes to a 700 action.
Gaillard tube installed and action trued..about $600-$650...or check with Rick at Alberta Tactical.
HS Sendero stock w/alum bedding block...about $500
B&C stock w/alum bedding block...about $350
I have two stainless fluted Senderos, a 7mm Rem Mag and an STW. Cost me about $1100-$1150 each. The 7 Rem Mag is 99%, the STW shows more use...and they are NOT for sale...