Check the battery again, they can go bad over the summer and function fine, until the harder starting winter months (happened to me).
Battery should be at 12v not running and around 14v with the car running. Also check the volts with the key in the cranking position, a severe drop would also indicate a bad battery.
Does the car click like the starter is engaging? If so, but that's all (just one click) check all your battery cables, my SVT did that a couple months ago, could clutch start it just fine (roll and pop the clutch). Positive cable had melted a bit and wasn't providing enough juice to the starter.
BTW what engine\trans do you have? | 
