+1 for Casey at TacOrd (probably just the mag extension from your list, but maybe wood). Great guy to deal with.
The factory +2 extension is nice and light and works perfectly well when it's set up properly. The "quality" (expensive) aftermarket +2 extensions are significantly heavier from what I've seen, and they change the balance of the gun quite a bit.
For your wood stock, be aware that some (most) of the wood forends are long enough that they prevent loading the mag tube with the slide rearward, and they prevent the use of a 6-rd sidesaddle. Not that I think you should do either, but some people like to have the option. The one pictured above is one of the "long" forends, for example.
I got a "police" wood stock set from Numrich. You might find other parts there, too.
What kind of sling are you looking for? You have many options...