If you don't mind long and scenic, 67 to 281S to 290E will take you there. It's about 5 hours. Went in my friend's 99, I havent done it yet in my '01.
On the way back you can get off 35 at near Carls Corner and take 77 to Waxahachie for a brief stint.
I too am interested in any other routes to Austin and some good drives near Dallas.