From what I've seen of Travis Burn, he'd be ideal. A slightly built player, but tons of pace, and gutsy defender. I can see him working well with Timmy. The only reason Manly are looking to lose him is for Jamie, otherwise they'd gladly hang on to him.
Blake Green? Yeh another good option, ideally we'd need two 5/8 options.
Michael Witt? He's rated behind Travis Burn, enough said.
Jason Smith? Firstly I don't think he'd be THAT cheap, and secondly I'm sure a few clubs would be interested. He still adds value to a backline, and provides the cool head, and sense of direction that is often needed. Be OK, but I'd prefer someelse else. My concern with Scott Hill is it's not a long term solution. More so for Jason Smith.
Michael Speechly? Here's a classic example - came over to the Eels from the Sharks in his twilight years and couldn't re-kindle the old form.
Given the lack of options - Travis Burns would be my pick.