^^ Hmm, interesting about the dps calculator. I'd imagine it's somewhat accurate, however, if you weigh up d6+3 sneak dice vs. +3 (PA3) +2 (2 starting str higher than any other toon +2 str enhancements). Tends to weigh out evenly.
The HO Rgr18/Ftr1/Rog1 is tempting as well, so I'm glad you threw that into the calculations. Good to know.
As for versatility, AC doesn't seem to important at end-game, particularly in epics. However, having a 50ish str and stunning blow with dual weighted weapons.... that's a different story altogether.
The HO Fighter, as you said, would be an absolutely disgusting monster with the HO Str enhancements + Ftr Str enhancements + Kensai power surge.... but Fighters tend to be a 1-trick pony.
Even giving up AC via /Monk and Combat Expertise, a Ranger is still pretty versatile if played properly. Great stealth; great ranged damage (hmm, Half-Orc Arcane Archer?
); healing capabilities via SP and wands; great buffs; etc.
There's just something about Ranger that tends to draw me over a Fighter. /shrug