I've personally not seen a lot of Chen or Wu Dang that measures up to the Yang forms that I study (btu the same can be said of virtually all Yang style stuff I've seen also)
My experience is exactly the opposite. I've yet to see any Yang style that is taught in a martial way. Although most taught (fixed step) push hands, they seemed to believe that this, in and of itself, would give the practitioner the ability to defend themselves. On the hand, so far ALL the Chen and Wu (Wu family style, not Wu Dang) that I have experienced (in admittedly small amounts) included both fixed step and moving step push hands, heavy application practice, fully resistive grappling, fajing (missing in 99% of the Yang style taught these days), and most also taught san shou. I'm not trying to say that there isn't good Yang style out there, just that as you say Gavin, the vast majority has been watered down for new age health hippies, and is totally devoid of any martial content whatsoever.
But I would second what you said regarding to look at all places first. I just generally dismiss Yang style because so much of it has about as much to do with martial arts as yoga does. This is in light of my own experience, but obviously is not the case generally, as you seem to have found something of value in the Yang style, so I probably shouldn't be so quick to dismiss it.
although all have silk reeling qiqong with some very very different approaches.
Interesting, I didn't know that. My understanding was the silk reeling qigong sets were created fairly recently by Chen Xiaowang, when he attempted to distill the heart of Chen Style. This was done in the modern period, so it would be long after the Yang style split from the Chen style.
--Chris