ditto, X-5 for a Clydesdale, get the quad bearing feature and if you really hit the burly terrain hard, maybe the heavy duty swingarm assembly too.
I've ridden Hecklers plenty, and I'll say this about them: (1) there's a reason SCB is making the Nomad. (2) the top tube is WAY too short for my tastes. (3) the rear assembly wags laterally and torsionally.
I rode an X-5 last season and am on a 6-Pack this season. If the 5-Spot's lateral stiffness is as good as the X-5's then I would urge the 5-Spot. Turner's geometry and handling are another class entirely from the Heckler. much better. see my 3 points above, and especially point (1) and think about these points for a bit.
I didn't like the X-5's steep head tube and if it were 69 with a standard Fox/Manitou 5" fork I would have liked it a lot better. but after riding the 6-Pack now, I think Turner's emphasis on a slightly different geometry and feel is better for my style.
Ventanas feel more like a hardtail than any FS rig I've ever ridden. the rear wheel path is dead perfectly vertical, no twist, no sway, no lateral play. This is an amazing feel when you are riding choppy descents at a good clip. you don't have to try to guess how much your frame's gonna flex in Section A vs Section B etc.
the 6-Pack is equally burly in the rear assembly, but it's designed more burly than the 5-Spot. that's why I'm a bit cautious recommending the 5-Spot for a clydesdale, but you can check around for personal experience from Clydes with 5-Spots -- I might very well be wrong in being so cautious.
