I spent the morning calling all the motorcycle shops I could find in Quetzaltenago, Antigua, and Guatemala City. Here's what I found:

PS: 1 USD = 7.75 Guatemalan Quetzals (Q)

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Quetzaltenango:
Comercial Aguilar:

Dunlop -- japonaisa; --- G501T ---- 1230Q
Maxis --Taiwain -- M6029; ---- 1290Q

Plus 30Q to install
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Antigua (la recollection):

Pirelli MT75 --- pavement only --- 710Q

Pirelli Scorpion -- dual sport -- 1425Q -- not in stock need to order it
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Guatemala City: Motoshop VRC

Pirelli -- Scorpion MT90
Precio: 1360Q -- 1224Q --- best price with discount
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Guatemala City -- Asi Asi

1520Q --- Continental Contri-tri attack --road only
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Antigua (Henry the mechanic)

pirelli -- scorpion MT-90....
800Q --- brazilana.

dunlop -- g501T --- (not sure if I got this model # correct) 1200Q ----
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I don't know a heck of a lot about tires... but it seems like I'd want a dual sport tire as opposed to a purely asphalt tire. So my thought is to go with the Pirelli Scorpion as it seemed to get good reviews on the Stromtrooper site. I'd love your thoughts!

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Hi I'm David; headed to South America via a Suzuki V-Strom 650.
http://www.davidparkinson.com

Hi David, did you get your tire? If you are able to jump on that Scorpion, do it. VRC runs out of tires very fast. I use them Scorpion S/T on my Suzuki GS650 and it is a great tire for Guatemala. Good in most conditions, even sand. If VRC in Xela is not helping you, I can , I know one of the managers in the city that can arrange locating the tire for you. Installation is another story, for none of the VRC shops have tire mounting machines. You will have to search one that will not damage the paint on your wheel.