Nothing against Gao style but I have only worked with 2 styles of Bagua and one was Yin and I rather liked it. The other I never remember if is was Cheng or Jiang style. Yin style is, IMO, a good choice and there are a lot of YouTube Vids of Yin style out there as well. I dont know anything about the schools you linked but there is a Yin Style Bagua Group near me that is part of this same group and I do know they are pretty serious about Yin Bagua, heck they train outside year around and in the Northeast that can get mighty cold, but they still train. Yin Style Info Baguazhang Xingyiquan is a wonderful style but hard to find teachers in that are high level. Also some styles of Bagua do have a form or two similar to Xingyiquan (I think Gao is one of those but I'm not sure). Also Shanxi Xingyiquan (I think it's Shanxi) has a high level form that is similar to Bagua circle walking but it is a much tighter circle.