RE: What rifle will cover ALL my needs???
Duffy has a good idea on the Encore. Heres another idea that is similar....but a little different.
If you really want to save $$ and are already commited to a Savage....what about getting a used Savage 110 in 25/06 and then getting one of the Adams & Bennet barrels from midway in either 35 Whelen or 338/06.
I would guess you could get the used Savage for about $200 and the cost of the extra barrel, barrel wrench, barrel vise, and the go, no-go gauges would be around $275. From then on you could switch back and forth if you really needed to.
On the Encore I think you need to have a scope for each barrel or you will need to keep mounting and remounting one scope to the switch barrels. On the Savage you could get by with one scope, but would still need to tune it in each time you swapped.