I have two rifles that have different optics setups that I'll switch back and forth depending on the match. For Tac Optics division at a match with targets at 300 yards or more, I'll use a Swaro Z6i. More high end scopes are coming into the 1x to 6x arena now so there are some other good options at that price point in a 1 x 6.
A 1x to 4x Burris MTAC or Bushnell AR optic is a great choice for something that gets the job done but doesn't break the bank. Our monthly Atlanta 3 Gun club match is basically rifle stuff in pistol bays with no long range at all. There, even shooting Tac Optics, I'll use my patrol rifle which is the same rifle setup as the Z6i (just a heavier trigger), an aluminum body Tactical CMore with co-witness back up irons. I'm not sure I'm not just a little faster with the CMore than the Z6i on non-long range targets; nothing at all to block peripheral vision and the Z6i and a mount is not a lightweight setup, so the patrol rifle is noticeably lighter which I like. Were it not for that rifle getting bounced around a patrol car on a regular basis, I'd have gone with the standard (non-aluminum) railway CMore.