I've been to Khao Thai (on Murray) a few times and overall, I've been pretty impressed.
The decor is nice - exotic and cassy all at once.
The menu goes beyond the standard Tom Yum and Pad Thai. Their salad section alone is worth exploring, and the vegetarian options are plenty enough that I can go back a few more times without eating the same thing again.
Word to the wise, though: the seasoning is for Thai palates. If you ask for mild (which I did, having just come out of the dentist's), make sure to clarify you want Canadian mild. Otherwise it'll still be very spicy.
Also, you might want to make reservations since the place is both small and popular.