I like the PA micro with a removable base. There are a ton of mounting options out there to get you the perfect co-witness. I went with the ADM mount because it's a true QD, it will return to zero every time, and it looks better than most IMO.

The TRS 25 is a nice little budget dot too, I just prefer the mounting options of the PA micro. Performance wise they are very close. Does anyone know the battery life on a TRS25? Bushnell doesn't even list it.