I got a chance to play with an Etek 5 a while back. I can say without a shadow of a doubt that it is the best mid-range marker out there - as a precursor, I am biased towards PE, but I've shot many other guns and always come back to PE. If your budget is more in the £1k range, The LV1.1 (you can pick up a used LV1 for cheapish now) or the Geo 3.5 are both exceptional markers - I briefly shot the Cyborg 6 and the Clone 5 at the weekend, they are both very good markers too - MacDev is pushing out some damn good stuff.
Not a fan of the DM14/15, it's too big for my puny hands. The Vanquish 2 I've not shot, so can't give an opinion.