Tacos El Gordo on the Strip did close due to some dispute with the landlord. I have to think they'll reopen in a bigger space on or near the Strip. If you find yourself downtown, there is another location up there.
I've been going to Tacos Y Tacos a lot. Their original location is in the Mexican ghetto East of the Strip, but they just opened a second location in a nice white people-focused strip mall in Henderson (suburbs). They're printing money.