Congrats. Huge CZ rimfire fan myself.
Depends entirely on use but I am highly satisfied with the Leupold glass, fine duplex reticle and AO on my 455 American in 17 HMR. It's a VX2 6-18. And to be honest the Leupold's looks and guarantee speak loudly to me.
The Leupold VX2 4-12 AO would also be excellent on the varmint and can be had for $400 out the door with 10% discount from optics planet- just call and ask for it any time. I have one on a 527 a American in .223 and it's an outstanding scope for the price. You can shoot at 100 yards+ and see the .22 holes perfectly. I skipped the CDS upgrade as I felt it does not help much when you know your ballistics and how to use the dials and/or reticle.
The VX2 3-9's are $50-100 less but you lose the AO and high end of magnification that I like for a dedicated varmint rifle like yours. Had one of these VX2's as well - best clarity of the the bunch but really missed the AO and added magnification.
I had the Leupold 2-7 rimfire too, also with fine duplex reticle, on a 452 and while perfect for shorter range uses like squirrel hunting and very affordable, it was not as well suited for the target work I enjoy most. The knobs were also subpar on the VX1 series; too small and the clicks not positive enough.
No personal experience with the Vortex to compare, but hear good things. A lot of the rimfirecentral CZ guys speak (write) highly of Mueller and Sightron so check those out too.
Good luck with the decision.
My 455 with the Leupold VX2 6-18x40 AO