I'm curious as to what kind of reach you're looking for. You mentioned the big stack of spacer you used on the Nashbar frame, which tells me you want your handlebars high, but as discussed in the Rivendell link higher bars yield an effectively shorter reach. If you want something with high bars and a long reach, you might want to look at frames designed for flat bars even if you intend to use drop bars. The Surly Karate Monkey comes to mind. Its biggest size has 632mm effective top tube, and while the head tube is a scant 125mm, the 468mm fork will give you all the height you need. The Van Dessel Whiskey Tango Foxtrot is another option which might work for you. On the other hand, if you're happy with the reach on your Nashbar frame, then a riser stem might be what you're after.

In the interest of full disclosure, I'm 5'9" and really have little idea how fit works for tall people. I'm just here for the math.