This probably won't help you much, but it depends on what you are going to do.
Basically three types of looms jack, countermarch, and counterbalance looms.
[You must be registered and logged in to see this link.]I have a Jack loom, because I wanted to do lace and that requires the shafts all operate independent of each other. I bought it used - you have to watch for warped pieces, broken pieces.
Also, wool takes a fair bit of experience to weave with because it stretches making tension harder to keep.
If you really are interested, go and take the intro to Weaving course at Olds during Fibre Week.
Then you can try some different bits and pieces and find out what will work best.
It's a pretty big investment, so maybe trying out a few looms might be the way to go.
Also, most of the weaving guilds, once you join, have looms you can borrow or rent to try out before making the commitment.