Re: Good Caliber
+1 on the Rem Model 700.
+1 on the .308. But this depends on what you mean by 'varmint' and what you mean by 'Long Range'. I've seen everything from .243Win, 270 Win, 7mm Rem Mag, 300 Win Mag and larger be appropriate for "long Range Varmints"
As far as the .308, here are some of its pluses
Long barrel life.
Great bullet availability.
Well understood ballistics.
Great gun availability.
Usable for Everything up to Deer size big game.
Don't skimp on the scope. 'Borrow one' from one of your other guns, until you can afford a good one. A high end scope will outlast several guns and you will have it for a lifetime of shooting.
Do you reload?
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives