There's also an El Tarasco 45 seconds from me & 15 seconds from Pancho's

Can't speak for the other ElT's but the one near me does not have beer/margaritas. But it's a very small place - more like a diner, which might be why. I haven't been to Pacos Tacos in a while, but I remember not being that thrilled w/ it when I went w/ FTers.
I'm waiting to hear if I'm meeting a friend that night who's in from out of town for just a couple of days, so definitely don't plan around me. Go w/ what works best for everyone.
med81, if I had a long layover like you do I would get a really cheap car rental (someone once posted you can get very cheap via Priceline) & get out of the airport etc. That gives you lots of options re: your free time & even if it's only from noon-6pm, still beats hanging out at the airport. Alternatively you can take the Big Blue Bus (do a search on the LA forum) & head up to Santa Monica.
Cheers.