If you're already spending that much on a scope, get a Nightforce NXS. Better quality, awesome optics. go to snipercountry.com and read the review. The guy hammered nails with the scope, and it was in perfect condition after (except for the finish).
As to fixed or var, depends on type of shooting. Tactical LE-style is better served with a var scope, while military shooting (from longer range) is OK with fixed.
I don't like the cheap adjustments (feel) on the Springfield or the Tasco. I like PERFECT repeatability on adjustments. Will the scope shoot boxes? The NXS does perfectly. The 3rdgen Springfield I (very briefly) had did not. The Leupold Tactical I had was ok, but not quite as good as the NXS. The Tasco, ?????
How fine are the adjustments? It isn't easy getting precision out of a scope that doesn't have at least 1/4min adjustments. A friend has a Leupold sniper scope that has some ugly elevation adjustments....I think it was like 1moa/click.
Just my opinion, but I think that the Leupolds are overpriced and over-rated. Used to be cutting-edge, but are simply not the best out there anymore.