Wirelessly posted (BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
I think there may be better credit-card offers that can be converted to AGR points than the Continental 30K offer; I would look at both the United credit-card offers, and the Chase Sapphire Preferred card offers. Both UA miles and Chase Sapphire points can be transferred to Continental's program, and then converted to AGR points.
But there are a few other issues:
1. If there are a total of five people in the OP's party (two adults/three children), then a single sleeper redemption will not be sufficient;
2. I would check AGR's 2012 redemption blackout dates to make sure that they don't conflict with the OP's travel dates; and
3. Even if there is space available today on non-blackout days, there is no assurance that space will be available when credit-card bonus points/miles are ultimately posted (and subsequently converted to AGR points in the OP's account).