FWIW, 6' wooden fence installed by union labor in the SF bay area runs $30-$35/ft. Just about every project I've ever looked at shows wooden posts in concrete, just make sure you vibrate the concrete to get the air out and that will solve a lot of your rot issues.
If you're going DIY, look into renting a small auger drill from HD or the like. Will make the day go much faster (that and I fucking hate post hole diggers).

And beware of the quality of some of the prefab panel systems. I was renting in a new development a couple years ago, and the fence panels were crumbling after ~3 years. Sag, rot, boards splitting, rust stains (they didn't use galvanized hardware) etc. This was happening throughout the entire neighborhood.
I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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