m3,
Last summer I had the same basic idea. I ended up with a new 870 w/synthetic stock. The Wingmasters (used) were few and far between.
OBTW, Clays is a ball!!!
I shot my first and only round last Summer and can't wait to try it again. I used the 870 and everybody else used an O/U. Yeah, if it had been competition I would have been at a disadvantage.