Wow, what a question.....I've got about 50 of them.
For accuracy, it's hard to top a Swede 96 or Swiss Schmidt-Rubin of any vintage. My 03 and 03A3 are right in there too.
For quality of craftsmanship, a pre-WW1 Mauser.
But the one that speaks to me most is the Gewehr 88. Butterslick action, and essentially a free-floated barrel in that jacket... very accurate gun, very cool looking. I have 2. One beater from OWS that LOOKS just awful, but with a mirror-shiny bore that will shoot 2" groups all day- about the best I can manage with those sights. The other not so shiny but still strong, and will shoot 3" groups. Not my most accurate but certainly my favorites.
How about you?