I think that the 190XPROB, which has the same horizontal center column capability, might be high enough, when you consider that a head adds at least another 4 or 5 inches, and especially if you have an angled scope. I have a 3001BPRO (which the 190XPROB replaces), and it is fine, although I'm not real tall.
I agree with your decision to get a tripod with the horizontal center column capability, if you are even thinking you might want to use it for photography. It adds little to the weight and not much to the price.
As far as a universal head good for scoping and photography, I suppose it depends on which you do most. I have a 700RC2 (the 701 is also popular but more expensive). It could be used for photography too, but it won't go vertical like a photo head will. A regular photo head like the 804RC2 (which I also have) wouldn't be too good to use for scoping, I don't think. One thing you could do, which I have had good success with, is buy a video head and a photo head, plus a short column (about $35) and permanently mount the less-used head on the short column. You can then switch heads quickly by just switching columns. (Of course, a short column wouldn't be much use horizontally. I just suggest it because they are cheaper than full-length columns)