I bring 5 rods. One usually has an unweighted, T or wacky rigged Senko, 1 with a C rigged or T rigged, weighted plastic (Rage Space Monkey, Rage Anaconda, Brush Hog, Kreature, Senko, etc.), 1 rod will have some sort of crankbait (deep diving during the day, surface in the evening, early morning or night), 1 with a jig and the last with some sort of plastic swimbait or maybe a spinnerbait.
I always start with the unweighted Senko because it seems to be the most productive under most conditions. I'll give it about 15-30 minutes. If I get nothing I move to the weighted plastic. If that fails then I'll move to one of the others.
Basically I'll give each lure about 15 minutes to a half hour.
If nothing is working after about an hour I totally reconsider the depth that I'm fishing at and/or the location where I'm fishing.
I don't worry so much about changing colors. I've found that if the bass are hitting a certain bait they'll usually hit it regardless of the color. I've been catching fish on a black Senko while my partner is doing equally well on a green pumpkin or chartreuse Senko.
It's only after a everything has failed that I'll start thinking about changing colors. There are occasions (albeit rare in my experience) when color can make a significant difference.