From what I gather, the Threshold doesn't have rack or fender mounts. I still think the Ogre is your best Option. Actually, since you're 5' 7", the Troll just might be better.Of course, these Surly bikes are all over $1000.

Perhaps something less costly would be better appreciated. If you can locate a Marin bicycle dealership, you might wanna take a look at the Marin Muirwoods. Marin makes both a Muirwoods 29er and a 26er. It's got wide tires (1.6in), fender, and rack mounts. It really kinda resembles a rigid ht mtb. The Muirwoods 29er sells at REI for $700. The Muirwoods 26er, generally sells for just about $100 less than its 29er sibling. You'd most probably profit more from the Muirwoods 26er. Muirwoods are labeled as "Urban" bikes. However, they'd take to the trails just as easily. Their frames are made of quality chromoly steel and they have hydraulic disc brakes.