I have a Hypertherm at work, and also have one at home. Work is the 30 I believe, mine is the 65. Both have been great.
I will say to think of what the thickest material you ever think you will want to cut, then go the next size up. Just my thoughts. Work wasn't thinking when they got the 45. I get into fabbing salter mounts and it just doesn't do well. They thought 5/16 would be the thickest. Cutting 1/2" I have to bring mine in from home, or just sever it, then cut again from the other side, then grind everything clean. I bring mine in and just cut it most of the time.