I'd stay away from the $129.00 one for sure. If you do buy an inversion table be sure and spend the extra money and get the Teeter Hang-Ups.
I did the research before I bought mine several years ago and Teeter has every other table beat in every way. Especially the testing they do on the safety of the table. Teeter is the safest, bestest you could buy lol.
I know you got the tens unit but I'm thinking thats for pain which is a good thing to have but an inversion table is a healing tool and worth every cent it costs. Its one of the best purchases I've ever made!