Doc, you NEED a Mosin-Nagant. At least one. They are the most bang for your buck currently available.
The M1891/30s are nicely balanced, although long. I think it would be really neat to take one deer hunting.
The carbines -- M1938, M1944, and M91/59 -- are light and handy, and belch out a HUGE fireball in broad daylight. (They also kick like a mule.
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The various Finns are the nicest of the lot, IMO. The Finn m/1939 is the most comfortable M-N to shoot (for me anyway), due to its weight and the stock design. The Finnish rifles are also quite accurate.
I have a Finn m/1892, m/1939, and a Soviet M1891/30. I need to get a carbine, either a M1938 or a 91/59 to round out my collection. Inspect any you get, though, as even the 91/59s have the occasional lemon. E.g., a friend has one and the bolt release is so worn that you don't need to activate it to just pull the bolt out of the rifle.