To my mind, I can't think of any OH politician that would stand even a remote possibility of beating Strickland - but Kasich presents a reasonable, even good opportunity to unseat the incumbent.
I would fully support you decision to not vote for Kasich based upon the Weapons Ban fiasco alone, but only if there was someone else with a shot of winning as great as Kasich's.
I played that game in the 2008 Prez election. As Jim Rob said in another thread - No More! I'll actively campaign against Kasich. I'm about as 'pragmatic' on this issue as some are on the pro-Life issue - iow, not pragmatic at all. Perhaps you'll understand that too. John Kasich (and his type) is exactly what's wrong with the Republican Party today.