Double downgrade - if injuries strike you may be forced to keep whoever comes in!
If you absolutely MUST, i would look at jeremy cameron, if for no other reason then ceiling. He has a 6 goal, 12 mark game, you have at least pulled a 120 out of the blue that noone else would have...
yeah personally I'm not that big on just spending to get the best player available. Without knowing much about your squad, Having 300k+ or so available next week would be huge. As opposed to having an inconsistent mid priced player you will want to rage trade if he doesn't perform tonight.