Should I upgrade to Sandi or my midfield first?

[hampdo]

hey guys, interested to know what people think is the more important upgrade to make. My team is:

Back: Goddard, Hodge, Enright, Malceski, Goodwin, O'Brien, Maguire
Mid: Ablett, Judd, Selwood, Barlow, Trengove, Martin
Ruck: Kruezer, Naitanaui
Forward: Chapman, Pavlich, Brown, O'Keefe, Higgins, Podsiadly, Rioli

Reserves are Davis, Webberly, Howlett, Shuey, Warnock, Lobbe, Gumbleton and Rockliff.

I have 10 trades and $263000
Is it more important to get Sandi  for Naitanui first or upgrade the two midfield rookies in Martin and Trengove? These 3 upgrades and I will be happy, but may not get them all done for a while because of being low on trades.
Cheers for the help.

[HillHero13]

get sandilands mids are strong enough to hold onfor a bit longer...

[hampdo]

Thanks HillHero,

the other option i was considering was trengove to hayes and  naitanui to cox, thought this means that i would probably have to not ever get sandi this season...
Thoughts?

[Prospector_1]

Martin needs to go very soon, and certainly get Sandi.