I wouldn't touch any of the horses you've posted so far with a 10 foot barge pole if you paid me to! The grey Arab has a scary back end, the chestnut Arab has a very Arab back end [and NOT in a good way, she has the bad halter Arab back end], and that TB has terrifying legs.
My filly is intended to be a showjumper and while she doesn't have perfect legs by a long shot she is MUCH closer to what you should be looking for. You just want something with shorter pasterns and thicker legs than my girl and you'd have a very nice jumping horse. Look for something that's similar in build to her. My coach says she could go 1* to 2* eventing easy, and B grade [4'6"ish] showjumping. Possibly higher if she has the right attitude.
From what other members here are saying, ideally you'd want something that's already going and fully educated in jumping. For starters, MUCH easier to jump a horse that already knows what it's doing, which makes things far more fun. Trust me, it's no fun jumping a horse that doesn't know what it's doing. They have brainfarts. I've been ditched more times than I can count even jumping experienced horses, but with the babies, they tend to jump awkwardly - and you have to progress when THEY are ready, not when YOU feel like it. I made the mistake of jumping higher when I was confident at a certain height before my horse at the time was ready and completely ruined him in the process. A horse that's already educated is a much better idea. Trust me on that. I haven't jumped in a while due to not having a sound horse of a suitable age and I'm going to be trying to find an educated horse to ride [or maybe just get some jumping lessons at a local riding school on an educated horse] before I start Magic over fences.
A CLEAN SLATE FOR THE FUTURE