All my peppers were grown above ground in elevated garden beds and pots last year, and did so well.
I've seen that Harbor Freight greenhouse before. It gets good comments from folks, but right now I am leaning towards an 8 x 12 Weatherguard™ Hoop house as a one year "experiment" to see how well other vegetables do in a greenhouse grown up off the ground.
If I have good results, I will then look for something larger and more permanent. I would love to get one of those growing domes, but the size I want runs almost $15,000 before installation.
I am thinking of a professional hoop house from a company called Tunnel Vision. A friend of mine has one where she grows herbs and flowers for her store. I could probably do one of these for 1/3 the price, or less, of a growing dome, and get the same size.