I don't have any Sporter models, but do have two Stealths (.22-250 Rem & .308 Win), two Ultimate Shadows (.243 Win & .308 Win) and a Super Grade (.270 Win). All of them shoot very well even with factory ammo, and when handloaded, are exceptional shooters.
If I were to go with an additional wood stocked M70, it would be an additional Super Grade, or a Featherweight. I do like the Sporter, but prefer the appearance of the other two models. If I were looking to get a take-anywhere M70, I would stick with that Extreme Weather, hands-down, and never look back. You will look far and wide, and spend a lot more money to outdo what that M70 EW rifle offers!
JMHO, as I contemplate my next M70. Edit to add a statement to review my old post here about my first M70 Super Grade .30-06 Sprg. To call it trash would be pleasant. Winchester stood behind it, and got me a replacement. As with any rifle, be sure to look it over before buying.
Geno