Originally Posted by BaconZombie
Sigh...don't do this, don't do that...
I'll at least give you an answer. I had a '03 SpecV show car with a fairly impressive sound system in it. I had an Optima yellow-top in it. It then got transferred to at least 5 more vehicle, including an Audi A4 1.8t and a Mazdaspeed 3. So yes, to me they are worth it.
I don't see anyone saying that Optima batteries are not good batteries. They are good batteries as you have pointed out. I have them in my other cars. I even killed one twice back to back and its still running strong.
However, the op asked about a good battery in cold weather. And unless there are really extreme conditions there shouldn't be a need for an Optima battery. The factory battery, in most cases, would be fine.
But by all means, if the deal is good and the person wants to upgrade then go for it. But by no means is it absolutely neccasary, imho.