I've found "get started now" to be quite effective. One small test showed an increase of conversions from 12/126 to 29/127, so up 140% (the loser there was "Create your free account now", the winner was "get started now").
I'm running a test right now, with "try it for free" currently at 262 out of 792 clicking through, and "get started now" at 269/778 (so up 4.5%). It's not yet conclusive, but at no point in the test has "try it for free" outpaced "get started now".
If my results ever show themselves to be "conclusive", I'll post about them at abtests.com. I'd encourage you to try "get started now", though, to see what you find.
I'm running a test right now, with "try it for free" currently at 262 out of 792 clicking through, and "get started now" at 269/778 (so up 4.5%). It's not yet conclusive, but at no point in the test has "try it for free" outpaced "get started now".
If my results ever show themselves to be "conclusive", I'll post about them at abtests.com. I'd encourage you to try "get started now", though, to see what you find.