Warren! meds! take your meds! heheh,

Just kidding.
I don't know Warren. The 460 is almost at your door. That is a fine .22 with the same power as the 350. If it were me, I 'd shoot the 460 and be content, BUT if you can afford and are seriously looking to collect Dianas, then go for it. $300 is a very good price for a fine German rifle and what you get. I can't make that decision for you. You will tune the 350 quickly anyway and make it a fine smooth shooter, so maybe you should get it, and then after you 've broken them in, you can give us a nice review or comparison 350 vs 460
Oh I also advise you to get a chrony so you can do before & after tune comparisons of velocities, etc. Like test a rife through the chrony before you send it out to have it tuned, etc. Then test again after you get it back tuned