I bought one here recently for $700 and change. The comment I hear echoed over and over again (on the net) is to avoid the new ones - post 1984 but especially late 90's onward. I don't own a new one so I cannot comment, but around the internet there are a lot of people griping about feeding/jamming issues. Take that with a grain of salt though, because .22 autoloading pistols are notorious for being finicky until you find the right ammo for them and people are too quick to gripe on the net.
The new ones are D/T for a scope mount. I wouldn't dare drill an older barrel. I'd just buy a new style barrel if I had to scope it.
Myself, I got lucky. Mine is a 1978 5.5" model but having received it, I was surprised to find it has the cocking indicator pin which is quite desirable from a collectors point of view. It must have been one of the last guns shipped with it. The feeling among the S&W experts is that the quality of the pistol slipped once they made changes to simplify (cheapen) it, the indicator being the first thing to go. The fit and finish is really great with high polish and deep blue. Still - any S&W 41 is a finely made gun. I understand there are just a couple of employees at S&W that still hand fit the few 41's coming off the line.
Accuracy? This is the S&W 41. Its like asking if a Ferrari goes fast!

Buy a clean used example, buy a $20 set of Wolff replacement springs (recoil, mag, firing pin), shoot 10's and X's for another 20 years! Its an all steel gun, built to outlast 99% of the junk sold today. Unless you are shooting at a highly competitive level, you won't ever need a better .22 pistol.
PS - its really meant for standard velocity ammo. I would shoot high velocity only occasionally (hunting if I could!), NEVER the hyper speed stuff like Stingers and Velocitors. There are recoil buffers available if you do want to shoot a lot of high velocity.