It turned out pretty nice for a bolt gun.
For a bolt gun? What do you consider better :wink:?
Anyways, I'd get something as plain-jain and close to the 98Kas you can. The standard German 98k is compatible with the most aftermarket parts and have the most options available.
Turkish Mausers have a handguard retainer at the front of the action, and take barrels threaded for small-ring actions (even though the Turks are large-ring).
The Yugo Mausers is ever so slightly shorter than the Germans. This will limit compatibility with anything that will change w/ the action length (bolt, firing pin, triggerguard/floorplate, etc). Anything not length sensitive (trigger, bolt sleeve, safety, etc) will still work on these. Unfortuneatly you'll need to find a stock specifically for these "intermediate length" Mausers as well.
Spanish large rings - I've had trouble getting a standard Mauser 98 cocking piece to fit one. The "key" seemed to match up to the firing pin differently. A replacement firing pin and cocking piece from a "real" 98 may need to be both purchased if you need to replace one. Otherwise, seems standard.
As always, try to find a gun that's already messed up for a project. There are enough of those out there that it's not necessary to tear up a good example. As a matter of fact if you find a good one and really want to sporterize it, I'm sure you could find somebody with a bubba'd job who will trade you their rifle + some cash in exchange for the unaltered one. This is ESPECIALLY true if you happen to have an unaltered German 98K
.
Regardless of what you get, you can still work around it. I've had rifles done on both the Spanish La Corunas and the Turks, and they turned out well.