Thai Basil on University Dr is absolutely delicious! When I lived closer to Tempe, it was one of the places I went to frequently, and I still make the drive to go there.
I typically get the Panang Curry with chicken but also really like the Drunken Noodles and Pad Thai. Every time I've gone with someone else they've enjoyed their meal as well. The veggies they use always seem crisp & fresh, and the spice level is always on point. If you ask for mild, it really is mild, if you ask for hot, they really bring on the heat!
My only note is that during lunch and dinner hours it gets really busy, and while they have parking in front of the restaurant, it fills up quickly. If you're going to get something to pick-up, I suggest going at an off-time so you don't run into any problems with that. Either way, the wait and parking pains are worth it!