I think Ben will. Unfortunately Tim might fizzle out and peak too early.
Tim might be like he how was in the first week - rude and annoying (he is sort of starting to be that way again). If he continues this people will start to dislike him and he won't be saved.
Who will likely to win:
Tim - Strategic, funny, controversial and he causes stirs (like last year's Benjamin)
Ben - Sympathetic, soft hearted, overall kind and humorous (people like that tend to win; Reggie anyone?)
Drew - Like Ed and Matt, but is more talkative, playful and social. If you're good looking and you have these positive features you can win (when he dobbed on Mikkayla to Heidi; that was just bitchy of him and I don't even like Mikka!) .
Possible winners:
Katie/Lucy - Nice people overall, they can be funny with they act awkward and people can like that.
Tully - She has a massive fanbase and is controversial. These type can win.
Jade - She seems brave, geniune and nice. People might feel sorry for her because Ed let her down a lot, so they'd do sympathy votes.
Matt - I only put him as a 'possible' because of his heartwarming friendship with Caleb. Perhaps people will save him more often.
Unlikely to win:
Tahan - Definitely will go further than those below, but highly unlikely that she'll win.
Ed - His low save votes were so close to Caleb's (any closer it will be a tie). Seems like the public doesn't like him much.
Heidi - Possibly leaving next week if she isn't saved. She adds nothing to the house. She seems like a poor man's Stacey.
Mikkayla - Might get sympathy votes as they always nominated her, but she will never go too far. She also adds nothing to the house and is boring as Sharon/Jasmine were.