I had completely forgotten Stoke & Hull made the final (so I looked it up). Some observations:
You forgot Watford :)
Chelsea have been in 4 out of the last five finals, but only won one of them (big game bottlers?)
Arsenal winning 5 of the last 8 FA Cups is WAY better than I had remembered...
Arsenal 14/1 with Billy Hill, which does look tempting (though they have had MUCH better results against poor & mid-table teams than the top 6). They should cruise through the earlier rounds, so a good acca addition.
It's hard to see beyond Man City (10/3), Chelsea (6/1) or Liverpool (7/1)...