Of the names mentioned Unai Emery would be top of the list for me. After that fonseca looks a good option, ten haag would be superb and Favre could be good but has a few question marks.
Terry isn't ready for such a big job, Lampard needs to find something with less pressure to rebuild his reputation and Gerrard comes across as a bit of a dinosaur who can get away with it in a very weak league.
Howe is a no for me and Potter, whilst doing okay, feels a bit "flavour of the month", gives me a similar vibe to when the fans chanted for Lambert.
Going way out there on a gamble Bo Svensson is one to watch, I think he might end up at a very big club in a few years but it would be a bold call right now.