I have just about all mentioned rifles above. One of my favorite to shoot and prob the most accurate of the group is the Czech 98/22 in 8mm Mauser. It is a heavy rifle and can be had for less than $200. Before the market ran dry I bought two gems for $70 each.
Another rifle that hasnt been mentioned is the Turkish M38 or the 03 Turk. It is a bit of a crap shoot with these but they can still be had in the cheap < $90 range. Ammo is cheap 8mm and are very fun. I have a few that will keep a nice 2" group at 100 yards. A few others that will keyhole at 25yards. Try not to buy a Turk blind. Get a good look at it.
Another that hasnt been mentioned and one that could interest you the most. The Swiss 1931 Scmidt Rubin K31 7.5 Swiss Caliber. Very accurate rifle! Easy on the shoulder. Ammo in the surplus variant hard to come by. But comercial is available and accurate.
K31 Some of the other guns mentioned on this thread are for sale at this site. I have done lots of buisness with them and one of the best in the buisness.