I'm still riding a 26 HT but considering a 27 or 29 even though I've never ridden either. Most everything I see out on the trails is 29 so I need to be like the cool kids....
I think I'm still waiting to see how the 27.5 thing pans out. The 29s look huge and I'm ~5'9" so it seems the 27.5 would be a good compromise.
Anyway, there's no shame. I'm still happy with my 26
for now.