In reply to colina:
I'm 6'7"
Macpac Minaret is nearly 7ft on the long side, thanks to an angled floor. They're good tents, but not freestanding (if that matters) and barely high enough to sit up in.
Hilleberg Jannu is quite long and strong but has a dodgy mismatch between fly door sill and tent door bottom (rain gets in).
Bibler (BD) Tempest is also long and is one I use regularly. It's a bit heavy for lightweight backpacking or climbing though.