Welcome to the forum Hans.
There are 2 flavors of Mauser Parabellum Lugers
1. Made during the 1930's through WWII
2. Made for commercial sale during the 1970's
As you do intend to shoot the gun I would suggest the more modern manufacture, or a mismatch from the early period.
Early period guns were hand finished and each part numbered.
When shooting a 90+ year old gun - parts do break - and get replaced
But a matched collectors gun is now an unmatched "shooter" grade and much lower in cost
One shot could cost you a couple of thousand dollars if you were unlucky
Get a shooter - leave the collectibles to the collectors.
Do go to the FAQ on this site, download, and read - a lot of your questions have answers there
http://forum.lugerforum.com/showthread.php?t=35479