My case is limited to 155mm. I went with a Spire Thermax Eclipse II (152mm). Since I bought it, they have now come out with the Eclipse III.
Other tower coolers to consider that I came across in my own search:
Gelid Tranquillo (153mm)
Zalman CNPS9900MAX (152mm)
EVGA Superclock/Swiftech Polaris 120 (152mm)
Tuniq Tower 120 Extreme (150.7mm)