Wow, just 3, assuming for hunting only. Would have to opt for:
Winchester Model 70 Ultimate Shadow in .270WSM
Remington 700 SPS Varmint in .223 Rem
Savage Model 93R17 TR in .17HMR
Of course, I would still keep my S&W M&P 15-22 and M&P 15 Sport, right? Otherwise, I might have to rethink my "varmint options".