The galleria area is a hot spot as well. Upscale and easily accessible.
The tollway area in Plano is also very nice.
I do pretty well off 75 in Plano but it's a bit far for guys that work over near I35.
Stay away from the unsavory areas near the intersection of 635/75, that whole Coit/Spring Valley area has really gone down hill. Not to mention the traffic!