If it were me, I'd take advantage to buy a decently priced late production version of the 6906's I carried and used for several years as issued weapons.
I carried some made from the earliest of the 3rd gen production, but the ones made toward the end of 90's benefited from better machining and revised parts designs. This means I'd prefer to have one with the MIM hammer/trigger; wide cut breech face & barrel tab; and the longer ejector. (Yes, it also means the plastic disconnector & mainspring cup, but I happen to prefer those, myself ... and I've been a 3rd gen pistol armorer long enough to have gone through the armorer class 4 times.)
First thing I'd do is to replace the recoil & mag springs, though. I like the factory recoil springs, myself, but Wolff does offer a nice 5% mag spring that isn't too hard to load, and ought to run at least as long as the factory spring. I ran some for a while and received good service from them.
I know some folks like to brag about how many years/rounds they can eek out of springs, but weakened springs run too long let recoil forces needlessly batter guns, and can introduce more potential for various feeding & functioning issues that can be real head scratchers. Why risk it? (Then again, some folks like to try and run every last mile out of their tires, too, and wonder why they get a blow-out when the belts have been showing for a long time.
Ditto pushing motor oil for too long.)
S&W took to recommending armorers replace recoil & mag springs either every 5 years (of duty use) or every 5,000 rounds fired, whichever came first. Conservative, but then I tend to replace my
recoil springs in the littler 3rd gen guns even sooner (and the
mag springs at least at the recommended time/use recommendation, or sooner, if it appears prudent).
The little alloy 69XX's run best when lubed (like all aluminum alloy framed pistols
).
I like the 6906, myself. Not quite as much as the 3913/3913TSW, as I like the slimmer grip of the single stack.
