Thai Style Noodle House is my favorite Thai restaurant in the north west part of town and tied for my second favorite Thai restaurant overall (tied with Ping Pong and behind Lucki Thai).
The service is always really good and the food comes fast, but is still prepared well.
I have gotten a few different dishes but my go-to is Pad See-eu with chicken and a spicy level of 10. You get a generous portion of food and it is simply delicious. I also recommend the pot stickers.
There are other locations in Las Vegas (http://www.thaistylenoodlehouselv.com/), but I have only visited this one.