I'd go with a rack grade Danish if you are planning on having it reworked. If rebarrelling isn't in the Orion package you want, get a Danish Service Grade and opt for the Springfield receiver.
My read of your situation is that collectability isn't as important as shootability. In that case a Springfield Danish in either Rack or SG is your best option. Some of the Danish have exceptional barrels, some are darned near match grade (those are likely to show up in the Service Grades.)
The choice of Winchester, IHC, HRA or Springfield is only pertinent to those who get worked up over the Chevy vs. Ford type arguments and collectors. Quality is mil-spec. across the board. Late number HRA's and Springfields may be in newer condition.
The Danish Beech stocks are ugly and cannot be easily redeemed. Beech is a tough, wear resistant wood, but also absorbs atmospheric moisture like a sponge. When it does it "moves," nofinishing method short of epoxy impregnating this wood will immobilize it from weather related movement. Obviously this sort of instability is bad for precision shooting...for combat shooting it isn't a big deal though, it'll still shoot minute of enemy.
Once you re-park a rifle, regardless of the originality of the parts, you've devalued it somewhat. For a collector, the holy grail is an as-issued rifle with all original parts, all original finish. BY original I mean that all the parts are the same exact parts as were on the rifle when it first entered government service. These rifles are rare as hen's teeth. They are usually rack queens that were never sent to a combat zone or otherwise received GI handling. Otherwise parts are likely to be changed out. The next best thing is a fully restored rifle wherein it has been restored to have all parts freom the proper manufacturers and drawing revisions and dates for that serial number rifle. This can be all but impossible to accomplish with rare rifles like IHC's and Winchesters.
Actually I amend this: The absolute holy grail of M1 collecting is an original gas trap (The first M1 gas system), but there is no way, no how you will ever get one from the CMP.
Those who claim that an M1's value will not be harmed by refinishing either the wood or the metal know little about antiques and collecting in ernest. Collector value is always enhanced by original finish, the better the original finish, the more value, but a worn original finish will be worth more than a nice-refinish job because it is closer to original condition, materials etc. It provides a better, more accurate look at how rifles were made, finished and maintained at the time, and not the fashion for restoration and refinishing in the late twentieth and early 21st century.
Enough of that. You, like most of us, are most likely a casual hobbyist who just wants an M1 for your own personal "collection" rather than for investment purposes. In that case, have at it and refinish it for your use.