SKS first: Fun and cheap to shoot, won't hurt your wallet or your shoulder. Easy to maintain (especially for a semi auto). A strangely widely practical rifle - good for plinking at the range, practising open sight shooting out to 100 meters. Cheap surplus widely available. Decent hunting ammo makes it a great deer gun in the bush (ballisticly similar to a 30-30). Good "ranch rifle" for all around pest and predator control (cheap enough ammo to shoot gophers with, powerful enough to take badgers and coyotes). You can, not, break, this rifle.
Mosin 91/30 second: Full powered, decently accurate, indestructible rifle for under $200??? Are you nuts? Just buy it. Buy a couple crates of surplus and "plink" with a rifle that's in the .308 - 30-06 power range. What's not to love?
SVT-40 third: More complex than the SKS, but a semi-auto with the power of the Mosin. Not as accurate as a good 91/30, but can be fairly accurate if you get a good one. And what the heck, just keep squeezing the trigger until the gong rings. Cleaing an SVT is a bit more involved, and time consuming, than either of the two above, otherwise I would place it above the 91/30.
Mosin M38 and M44 4th and 5th: Round out your WWII reds with a couple of sweet carbines that throw a cannonball surrounded by a ball of flame. Depending on your budget, I might actually swap places with the 91/30 with one of these. Handier, easier pointing rifles than a 91/30, and much much less common. Also double the price, but for the quality of rifle you're getting, still a bargoon.
VZ-58 style last: I don't own one, but it is on "the list" (I own at least 1 of all of the above). The reason I'm not in a rush to get one, is that these are still in production. Price might creep up a bit, but they aren't going to vanish. All the other rifles will dry up sooner or later, which is why you should grab them first, and not end up kicking yourself for missing the boat.