A few quick points (and Isaac has my email if you want to talk further):
Blew the living sh*te out of my ankle (broken talus, busted ligaments all over the place, needed to be surgically put back together) last year in And1s after suffering stress fractures the year before in the same shoes. They are the most comfy shoes to wear but for performance and safety, they are trash. Sensational leisure shoes though.
Nikes still fit the bill. Buying online is fine if through a reputable site. I buy through Eastbay.com, as do other players I've played with for several years. No hassles and a good range and good prices, esp if you're not fussed about orange, light blue or other "US College-style" colours. The US-AUS dollars are about the same, so all you pay is a $40 delivery fee and the shoes are yours. I bought two pairs of Nikes recently and they're great. Aim for what you want though and as the previous poster says, it's all about how the ankle is supported, not how high the boot is.
That said, bring back the Nike Air Force 180s with dual pumps and super-high cut. They were the bomb. Mind you, at $420 .....