Any manager that understands there's defence AND attack. Not just defence. Hughes and poyet are probably our best bets.
I think all the different names mentioned just shows how difficult it is to please everyone and what a very difficult decision that Quinn and the MD Would have if Bruce was to be sacked or leave. 
Lets get realistic Which manager is going to come and work on a small budget thats a fact thats why we have no N,Zogbia, Bent went and now Gyan (i know two of them it was greed) I reckon Bruce has 3 games to get a couple of wins. If not don't expect a top manager to come withour wanting a Budget. What has Hughes done that Bruce has'nt I say get a top manager and give him £50m for starters. You never know we could win the next 3 games (frightening i know) because that means the Jan transfer window we will be looking at a few cheap midfielders lol
Some days I think Joe Kinnear would be an improvement on Bruce , but I would seriously love to see Moyes here.
Moyes would be the only man for me. BUT there is no chance of it or any of the other names you have all mentioned because if we have no money for players were certainly have no money for compensation for Bruce or to pay a new manager.