Ok, I've decided on the Hardrock Sport. When on the test rides, there weren't any dirt or extreme uphill climbs, so I wasn't really able to experience a full test ride.

I am 5'10" and about 148lbs. I felt the most comfortable on the Small Hardrock Sport which is 15". Normally people would recommend that I get a 17" frame, but I didnt really feel good on one.

So my question is, will I get any surprises when I take the bike onto the bumpy dirt fire-trials with such a small frame. Thanks.