Hi,
I have two floor hoops. One is round and made by Hintenburg I believe. It is a 30 inch circle on a central post that has three legs. It tilts in any direction. It cost between $100 and $150. I sit in a wingback arm chair with the post between my legs and tilt the hoop into my lap. It works well for me. My other hoop is made by Grace and is a rounded off square that is mounted on an arm that sticks out from a post also with three legs. It also has a swivel lamp mounted on the top of it that I can swing over my work area. The main problem I have with it is the area where the arm projects. The bulk of the quilt gets hung up in that area when a rotate the hoop. It was less that $200. I ordered it from the Grace company when they vended at a show I attended. They gave me free shipping and the lamp for free for purchasing at the show. I currently have a quilt on each hoop. One is in my family room in the basement which we only use when we start a fire in the woodstove. That happens at least three days a week this time of the year. The second is in our upstairs TV room. I currently have both quilts at least half way finished. There is a hoop available that looks like a large embroidery hoop that has three legs and a wooden board underneath. There is plenty of room between the hoop and the board to reach under the top with your underneath hand. You can also rotate the hoop around. The whole thing sits in your lap and supports the weight of the quilt. I have a friend who is also a handquilter for hire whose work has won awards that uses one all of the time. They can be purchased also. I have seen them at big shows. When I take small items, wallhangings, pillows etc to a bee or on a trip with me I use a plastic PCP pipe frame as it is collapseable and portable.
Experiment, borrow from a friend or get a shop to let you play with one on display. Find what suits you the best.