Mauser conversions are great.Agreed on .30-06, especially if you are not a reloader. M1-safe rounds will work great in any vintage bolt action too.
Gonna disagree with you on this one regarding the 1917. Different, but not better. @Rockrivr1 should check out '03's, 1917's, and even 03A3's before picking one. I find the 1917 to be much more cumbersome to shoot vs. an '03.
An Israeli Mauser in .308 would make a cool vintage bolt gun with the easiest ammo to find. Most if not all of your Walmart .30-06 ammo will be heavy hunting loads that shouldn't be run in vintage iron.
I love my 45/70 Mauser.
A well made conversion with nice wood and refinished rifle looks awesome. I love that safari look that is so hard to get today.
As far as history, I am one of those that likes to rpeserve history, but there are millions of these rifles floating around so I don't mind a nice conversion.