For cold weather, I like UnderArmour ColdGear. That and a nylon shell gets me down to about 20F. For summer, I like UnderArmour (I have a couple HeatGear shirts), but I think it's overpriced. $10 at Target will get you a $25-$30 UnderArmour quality shirt. Jerseys have some nice features (pockets in the rear and a zipper in the front), but you pay A LOT for those features (I'll have to look at that $20 Performance one).
For someone who rides nearly everyday, I don't think the money is worth it. But I have a commuter with a rack that can take panniers or a trunk pack. Roadies have less ability to store stuff on their bikes.