Of the four listed I would focus on the Bushnell or the Primary Arms. The Mueller's aren't bad, but in my experience with them 12-13 years ago the seals have a tendency to fail after a couple of years.
I currently have a 6-18 Bushy Rimfire on my Ruger 10/22 that I use for ABRA benchrest and have been very happy with the glass - especially for the price. Have had it about a year now and no complaints.
No personal experience with the Primary Arms optics, but I know a lot of guys here speak very highly of the 4.5-14x model.
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