No personal experience with the equipment, but ...
There are a lot of Lang users on the National Barbeque News Forum, you might want to ask over there. A couple of caveats though. They tend to get a kind of herd mentality over there. If one guy uses something, often everyone else climbs aboard. It's an echo-chamber when it comes to "you got to get you a Lang" But in this case, that's a good thing. IIRC, there are Stoker and Guru users both. There are some people representing at least one of the lines who post there too. So hold on to that grain of salt.
For heaven's sake! E-mail Ben Lang and ask him!
From what I've heard ... for a single application like yours, Guru and Stoker are equally effective, but Guru is less expensive by far. Unless you're the sort of geek who wants to run his cooker with PC Anywhere from 800 miles because you can , and it's cool, less expensive will probably be determinative. (Did you list "Stealing Software" as one of your favorite activities? If you bought PC Anywhere or they gave it to you at work, you're not the type.)
What were we talking about?
Klose Steak Grill with Swing Set
Backwoods Fatboy with DigiQ II