Hi S.
I think you may be right... our mailing address is Arlington but we actually live in Kennedale school district. We live east of 287, north of Sublett (basically directly across 287 from the school, but in the subdivision off of the frontage road). Anyway, I can not knock the Kennedale school district since I have never sent my kids there. We send ours to a private school solely because we desire that. Our neighbors' kids go to Arlington Classics Academy and that is an excellent school. BUT the wait list is pretty long. They do a fresh lottery every year, so even in 2011 you would be put into the pool with all the other new applicants. But it is worth checking into.
I will say that all our neighbors did not have anything positive to say about specifically Patterson Elementary (KISD) but that they did love Arthur Middle School (5th and 6th grade in KISD). If Patterson is the school you would be zoned for, I would just look at it yourself. Sometimes some people don't like a school but it would be just fine for you. The best way to judge it would be to get a gut feeling. Then you can trust your own instincts.
and, if you move over here, I belong to a fun mom's group that I found through Mamasource, and I'd love to introduce you to the other moms, if you're interested.
Have a great day and good luck!