*Ruger 10/22: not the best rifle, but *easily* the most upgradeable and widely available. It’s fed by removable 10 round magazines and good 25 shot magazines are available from Ruger. They’re generally reliable but mine refuses to work with anything but Ruger magazines. They do have a problem with scopes. The scope mounting system blocks the shooter from seeing the iron sights, and the scope rail needs to be glued down with Locktite. Hence, 10/22 shooters must choose between iron sights and optical sights (scopes & red-dots), or find a workaround. I own a 10/22, so I’ll have more to say at a later time.
*Marlin 60: Marlins are especially accurate and the Model 60 is one of the most successful 22 rifless in history. The Model 60 is fed by a tubular magazine that holds 14 rounds. There is an aftermarket Dragunov stock available for that ‘tactical’ look. Scopes mount directly to the receiver so there’s no problem with switching between sights & scope.
*Marlin 795: I don’t know much, it uses removable magazines and 30 round magazines are available. Scopes mount directly to the receiver so there’s no problem with switching between sights & scope.
*Remington 597: The 597 has an unusual magazines design that I suspect is superior to the Marlin 795, but I definitely think the 10/22 mags are still the best. Some models have a thin barrel and tradition sights while other models have a heavy tartet barrel and must use a scope. Unfortunately, the scope rail bolts on to the receiver similar to the 10/22 and may block the view of the sights. Still, don’t dismiss the 597 just because I’m mentioning it last. Centerbalance Systems makes a $300 upgrade: http://www.cbrps.com/rem_flat_op_554x214.jpg