7 A's are fine if that is what is comfortable for you,I keep some regal tip 7's in my stick bag for a couple of fast tunes,the taper on them is thin,which makes them fast,but more breakable.I find that with big and/deep drums I feel like I have to bash to get the drums to respond and be loud when playing with a band,and they kind of bounce of of med crashes with 7 a's .Durability is an issue to but I suppose you could try oak to cut down on breakage if that is a concern.