A lot depends on the bottom metal that comes with it. If you can find a commercial action with a hinged floorplate that's often a really good. The only real advantage of the 1909 Argentine is the hinged floorplate.
The big difference between FN actions and Mark X's is the FN's are better finished, but that doesn't make all that much difference on a custom rifle. The Husqvarna's are very nice.
You'll have to spend more money getting a military 98 sporter-ready than a military action. Some of th emilitary actions will vary in quality depending on when they were made. VZ24's, for instance, are usually pretty good actions, but those made in the middle of WWII aren't nearly as well-finished, and the steel can be suspect.
These days, if I had to make a choice between a military 98 and CZ 550 action, I'd take the CZ, especially if I was contemplating a .300 H&H.
