As usual, I have an opinion

Two things to keep in mind about all of the "power foods": they are very calorie-dense and they are very $$$.

In my opinion they are highly over-marketed. They have their place: they work well when an athlete is going so hard, so long and/or so fast that "real" food isn't practical. Generally they are used in events lasting more than 1 hour.

Personal favorites in this catagory include Clif Bars(peanut butter), Hammer Gel (raspberry or vanilla) and Cytomax (citrus).

For training or "just riding" I stick with Gatorade (I buy the powder at the grocery store), bananas, Fig Newtons, and basic cereal bars (those Kashi bars sound neat!).

If I am riding for 2 hours or less I'll take just take water and perhaps Gatorade in one bottle if it's very hot. I carry $5 in my jersey pocket "just in case". For longer (3+) rides I'll throw in a bar or two and a banana. Luckily most of my routes pass by rural groceries; if I need more calories I can stop and buy a packet of Fig Newtons and an extra Gatorade.