Well, it sounds like my local riding and preserve few are much like yours. I’ve got a Buzzard and I’m 100% confident it’s more ‘fun’ than the more XC-orientated alternatives (I have an SS Inbred 29er for that stuff). I’ve yet to ride it on a full-day epic but I reckon it would be fine. Top tube is short but doesn’t really feel it with the wide bars the bike deserves.
If you lean more towards the fun side of the compromise then I think your best options are Canfield, 2Souls, Honzo, Taro, Buzzard, that new Niner and the Cromag. Have I missed any?