I haven't thought that far ahead yet. The tank is about 18 months old, and was $300ish new. The lights were $280 (I just looked it up). I also have a aqualife 115 skimmer and heater (probably another $100) When you add shipping it puts me well past $700 (new).
It also has been modified, and has 2 return pumps instead of one.. Although, I believe one might need to be replaced.
I know I'm not going to get anything close to that, but would entertain offers between $400-$500 (depending if you want the heater and skimmer, and???)
The light upgrade is pretty cool. I used the customer Heatsink from nano-customs, and have upgraded fans, as well as the drivers and dimmers all under the spashguard. You adjust the brightness through a dial that is through the lid.
If my memory is correct, there are 16 blues, and 12 whites. Way overkill, but I was able to fit them in, and figured why not? They put off a nice spread too.