Not really, Dallas is mid-south. It's in no way on the western part of the US, in fact I think I would get a better ping on Chicago servers than Dallas, and I live as far west as possible (other than Hawaii of course).
If you hadn't figured it out yet, it's not really about you, it's whats best for the majority. Let's look at numbers here.
California has a population of 36,000,000, Texas 24,000,000, Washington 6,000,00, British Columbia (West Canada) Population is around 4,500,000, and Alaska has a population around 690,000 of which you are probably the only person representing the M&B. I'd say that a server that suits a VAST majority would be much better bet to please the Western population.
If you look at the current results from the poll you'll see a tie between 3 major US choices. It seem to me a middle ground between them would be the best choice. Oh look Salt Lake City is about equal distance from LA, Seattle, and Dallas Texas.