The WASR-10 is a good rifle. If you are a novice with machines and such, just buy the double stack, pistol gripped type to begin with. If you are experienced with machines and taking stuff apart, you can buy a single stack type, a US made stock and parts kit, and open the mag well up with a dremel, or you can use a file and liberal application of elbow grease to do that.
As for its accuracy, I can consistently peg a 10" diameter peice of granite (a great reactive target btw, it makes a dust cloud that appears and disappears in an instant) at 100 meters, and that is sustained rapid fire, with uncorrected 20/70 vision. Just inspect the bore, and make sure the front sight isnt canted whe you buy it and you should be good to go.
One other thing, if you use the same scope for both rifles, chances are they wont have the same zero, you should probably zero it on both weapons and mark the knobs with color coded ticks (ie. red ticks line up for one rifle, blue ticks for the other, etc). Also, depending on the exact mount you use, whether a picatinny base or a scope with an integrated mount like the russian military type, you might have zero retention issues as you transfer it from one to the other repeatedly.