You would be pretty safe with either Victoria Palms or Llano Grande. I believe they have common ownership. They are both big parks with all the amenities.
You could also go to
www.rgvparks.com and request the map that they offer free. In a few days, you will get a map in the mail, plus a deluge of brochures from various RGV parks.
There will be a lot of MOC people in the valley, we will be at Bentsen Palm Village. Go to the Forum Section on "Camping Clubs within the MOC" and find the one on the Rio Grande Valley. There is more information there.