Tim and Kirsty's team set an (at the time) record for most sales on pretty much exactly this task, and neither of them won, so I don't think Liz is a lock (snerk) to win.
At the moment I think Chris, Christopher, Stella, and Liz are the obvious contenders based on how the show's worked before. Christopher I'd be on the verge of ruling out based on the fraud/porn stuff, but I guess you never know. Stuart, Sandeesh and Alex have all been sold by the show as making delusionally stupid statements that rule them out (I am a brand/I will propel you to world domination/I invented the bus), Jamie's audition tape was hacked up on the show's website to make him look like a moron, Paloma's very much a "baddie" and the show tends to want you to like the winners, Joanna's a convicted racist and an on-show troublemaker, and Laura's weak as a kitten (although I have an itch that she makes interviews or gets close).
I would say that maybe the show will do something new and have a different sort of edit for the winner, but it hasn't really so far.