I really want Gresham. He'll be a little gun. If it's a choice between him and Ah Chee, it's a close one, because I love Ah Chee's skill set and attitude. But there's some risk of him becoming a type who only impacts when things are going his way. Gresham is as consistent a footballer as they come - he basically carried his TAC team this year. There's virtually no risk of him not showing up for a match, ever.
He's a better ground ball player than Ah Chee which is something we need more than aerial specialists IMO. We have Lennon, Deledio, Riewoldt, Vickery and so on up forward who can all clunk a grab, but only really Martin who's dangerous at ground level. Gresham will add another dimension, plus the ability to rack up a shedload of possessions and get the ball moving in our direction from the coal face. Ah Chee doesn't, and won't ever have that ability IMO.
Gresham is a more complete footballer. Plus he's a Knight, we love those. I'm sure we'll be all over him if available.