I'm tall and with a bad back. Given our other criteria (particularly that it be light and easy to one-hand-fold), we've shortlisted the Maclaran Quest and the Jane Energy pushchair. I've tested the Quest, and I think it's good, but maybe the handlebars are a tad low. I can't find the Jane pushchair in a store anywhere, so I haven't been able to test it, but I hear the handlebars are higher, which is good.
Any other tall mums out there with experience with the Quest or Jane Energy? My hunch is that the Quest is the better product, but I don't want to regret having too-short handles! Test-driving in the shop is one thing, but walking day-in-day-out is quite another!