I have a Weaver that I like. Some folks down them, due to the fact that Weaver used to be an American-made scope, and now they are made in Japan. (Even Leupold uses Japanese optics). For the price, you're getting a good, solid scope. ATK (Speer, RCBS, Federal) bought them back from Meade. The warranty should be a good one, now (lots of folks complained about Meade).
Overall, the Nikon Team Primos is probably the best deal of the bunch. You are getting a $300+ scope for $199. Some have complained about Nikon customer service in the past. I don't have any experience with them, but from what I've heard (24hour campfire forum, etc.), they are making a concerted effort to improve that. I plan on buying one of these in the next few weeks.
The Sightron is supposed to be a tough scope, and the company has, by all accounts, excellent customer service. The optics are multicoated, though. Not FULLY multicoated. That means while some of the lenses are multicoated, not all are. This could affect light transmission.
Can't say much about the Burris. As for the Nikon Buckmaster, you might as well spend the extra $10-$20 on the Team Primos.