Most of my 8x10 film holders are wood. I like the black ones marked "Graflex made for Eastman Kodak." and use them in my 'dorff most of the time. I haven't had any problems with film registration of warping. Another good brand are the Agfa /Anscos. Either one should serve you well if they aren't leakers (I've had more modern plastic holders leak as well. Just test them out with photo paper before you use any film holder) For plastic 8x1o holders I look for Liscos. IMHO it dosen't really matter if a holder is wood or plastic as long as it dosen't leak.
When you get a stack of old holders, vacum them out really well, make any repairs that might be needed and put a bit of wax on the edges of the dark slides (Pledge sprayed on a cloth diaper or paper towel works fine) to keep them, well, sliding
When I bought most of my 8x10 holders they were 2/$25 for the plastics or 3/$30 for the woods. Being on a tight budget I bought the wood holders and haven't regretted it.
As far as film registration goes you can check that yourself. Remove the lensboard (or just the lens) Put a holder in place, pull the dark slide and measure the distance between the front standard and the film plane.
Enjoy your 8x10