You forgot Evergreen 228 in Chamonix Mont Blanc France. Most difficult than all of those triathlons. 5000 m D+ bike, 2500 m D+ run trail. realy difficult, but so beautiful.
How about the awesome new XMAN Wimbleball race last weekend - might not be the toughest but it's certainly up there in terms of hills and thrills and reasonably priced! with a proper trail run thrown in! they say add at least 2-3 hours on your usual full distance time check it out here: http://xmanevents.com/xman-wimbleball/
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Projectdm.org
That's a new tough one.
Triathlon X
I found Celtman enjoyable.
How about the awesome new XMAN Wimbleball race last weekend - might not be the toughest but it's certainly up there in terms of hills and thrills and reasonably priced! with a proper trail run thrown in! they say add at least 2-3 hours on your usual full distance time check it out here: http://xmanevents.com/xman-wimbleball/