Whatever scope maker you go with, get plenty of magnification range for that flat shooting cartridge. A 5-20 would be great, but I'm a fan of 4-16 and 4.5-14. I have a Vortex Viper, and I gripe lightly about it, but I really do like it. And I have never had the slightest gripe about my VX3 Leupolds, which really are a big step up from my VX2 level scopes. So if you can swing the expense, and if you aren't a turret cranker, I suggest the Leupold VX3 4.5-14x40 with the Varmint Hunter reticle. It isn't way more expensive than the 6-18x40 VX2 I have on my 223.