The best chile rellenos I've ever had are at Pancho's Mexican Buffet. We have two of them here in Arlington. I believe On The Border's are pretty good, as well. Can't remember about the ones at El Chico's and El Fenix.
Oh my Lord! Just by mentioning El Chico's and El Fenix you've gone and shown us your true colors on Mexican food. I think my daughter took me to Pancho's once. Is there one close to Six Flags? I've been trying to forget about it ever since we had lunch there, so I might be wrong.
Ya'll northerners (BIG grin) really need to make a road trip south. I'm very concerned that you all may have forgotten what good TexMex is. Let's all meet in San Antonio (off the River Walk), have some great TexMex...and plenty of good tequila. Then ya'll will remember what really good TexMex is. The next day you may not remember much about the evening before, but I guarantee you'll have fun while you're there!