Schwalbe Marathon Plus
Continental "Plus" series; Super Sport Plus, Top Contact Plus, Country Plus (all have a puncture layer similar to the Marathon Plus)
Slightly less weighty, there's the
Panaracer T-Serv Messenger and the RiBMo
or Soma Everwear which just has a beefy 5mm outer.
__________________
"I feel like my world was classier before I found cyclocross."
- Mandi M.