I know these 3 tripods are good (but not the best). I've heard that the Vinten Pro5 is a Manfrotto (501 head with 520/3283 leggs ???), the libec M20 (or TH-650) is the less expensive. But which of them is the best? Thank.

You can see the Vinten here:
http://www.cke-distribution.sageweb.co.uk/catalogue/pr1718.htm

i've owned both the libec thm20 and the bogen 501 (3221wn kit). neither one is perfect but my vote goes for the bogen. i ended up selling the thm20. for industrials, weddings or general use i would say the libec is a great buy. i felt the movement independent from each other was smooth but the lack of tension made it difficult to get the proper combination for silky combo moves (pan/tilt).

mb4

Vinten is an independent, English company. Bogen is now a division of Manfrotto. Other than physical similarities, their product are not related. Vinten Pro5 is a better tripod than the Bogen 501. Smoother, more consistent and predictable movements separate the head performance. Price separates the Vinten and Bogen also.