Before I buy another 22, unless you really want another one and I see no problem with that, I'd give your old one a good cleaning. You may have some significant fouling in your bore.Buy yourself some copper/lead remover like Hoppe's Elite metal remover and a 22 cal bore brush and scrub that bore good then run some patches through it. Then by yourself several different brands of ammo, Win, Rem, Eley etc. and shoot it off a solid rest and see which ones shoot the best and if your groups tightened up from the cleaning.
If not, then you may consider trading it in on one of the rifles you have your eye on. Like the previous posts stated the CZ is probably the nicest. I have no experience with the accuracy of these rifles. The Savage's are usually good shooters. My Mark II shoots great. The Remington, I don't know about. I've been skeptical of Rems quality lately with their rifles. I know they have their following and I was one of them. All my rifles used to be Rems except for maybe one or two. Now, I only have 3 and these are old ones when they didn't seem to cut as many corners. My others have been replaced with Savage, Ruger and Browning rifles.