Free: Contests & Raffles.
I have a Leupold VX-6 HD 3-18X44. Its a nice scope and I have had no issues with it. My eyes aren't as sharp as they used to be. I got it at a good price through Leupold. Razor is a nice scope as well. The Swarovski is a really really really nice scope. I would go Swarovski if price didn't matter, otherwise it is a toss up between the other two.
Might want to check out Zeiss. I have a Conquest HD5 and its a Conquest HD5 scope, their new line that came out last year might have one that fits your requirements.