Would you say this is a good deal for a used 180G setup

[rk01]

I've been offered a 180 Gallon saltwater aquarium for $850. The aquarium is up and running right now, but with no fish.
Here is what is included:

180 gallon Reef Ready saltwater aquarium
Cabinet/Stand
"Aro Ballasts for halides and vho actinics"
Coralife Super Skimmer Protein Skimmer
"Heater"
Aprox 100lbs of live rock "$800 retail"
Live Sand
"Very Good Condition, already cycled, just add fish"

What do you guys think? What questions should I ask when I talk to him next?
Here some I was thinking of:

About how old is the whole setup?
What brand/model/watts is your lighting & type of bulbs?
Possible to get a model of the coralife super skimmer?
Model/Watt of heater.
Additional items, such as salt, test kits, etc.?

I'm completely new to Saltwater, but have been doing lots of research on the forums. This seems like a good price, with the skimmer and rocks, but I really need some expert advice.

Thanks for listening!