I see they have a 'recipe' on their website that calls for the use of their mix. Since I don't know what it tasted like it's impossible to know what you mean by a true chili parlor recipe.
The basic recipe for Texas chili is Frank X. Tolbert's Bowl of Red which you can find posted online on lots of places. I think it's a little one dimensional but it would be a place to start.
The basic chile used in Texas chili is ancho but the proportion used in relation to other ingredients can vary widely. I like to add at least 2 other chiles for a little complexity. The first additional one these days is always chipotle, then might come guajillo, arbol, pequin, New Mexican/Anaheim, and so on. It's not that hard to prepare your own spice mix from scratch and the resulting chili is going to be much better than what you can make with a mix or packaged chili powder. Just remember when prepping the chiles the more seeds you remove, the milder it's going to be.
I don't have a tried and true recipe because I like to experiment and if you're making the spice blend from scratch it's going to vary anyway because the chile's themselves vary.
Wick Fowler makes a very good complete mix that you may be able to find in Seattle stores. I like it also because the various ingredients are in separate packages so you can control how much to use (you might want to use less that the full amount of chili powder and red pepper for instance). All other ready-mixes I know of are premixed.
As far as starting just with a prepared chili powder there are hundreds if not thousands on the market made by all the spice companies. The best I've found for a bowl of Texas Red is Penzey's Hot. I see you don't have a Penzey's store in Seattle but the stuff you order online is likely to be fresher anyway because of greater turnover.
If you don't want to go to the expense of mail-order then just start trying the chili powders/mixes available in the stores. If it's a see through package, look for one that's about the same color as the chili you liked.
Just remember, if it says use hamburger meat, which a lot of them do, ignore it and use chili grind or cubed meat, use more of the powder or mix and simmer longer to account for the larger size of the meat pieces.
<message edited by dexmat on Sat, 01/10/09 11:26 AM>