I had a yellow top in my old 98 s-10 zr2 truck. I didnt have any problems with it in the year or so i had it in.
I have dual optima yellow top batteries in my 97 jeep wrangler, and again, i havent had any problems with them.
I have found the best prices on the optimas at a local Farm & Fleet/CostCo. Last time i checked the red tops were going for $100, and the yellow tops were around $130.
I bought the yellow tops for $150 each online with free shipping. I didnt know that the local Farm & Fleet sold them, otherwise i would have bought them there. But with tax, it would have probably been a wash.
Tim