I'll throw the first questions that came to mind for each one that you might want to persue or consider. If you have the $$$ availble, grab the best deal on a 150 (display) and a 125 (for a sump) package and build a high volume system...if you can manage to grab the ones with the better lighting and a get a pair of skimmers, what you get with each package deal in lighting and parts would likely save you a lot of green later, otherwise the extras will make for great trading/selling stuff later too. A pair of these setups isn't a bad deal at all for $1K, you could easily drop 3x that amount just setting up.

125 gallon AGA around 1 year old and in great condition
Comes with 1- 300 watt Finnex heater
2- Seio 1100 Powerheads <--good
Coralife lunar Aqualights [4x96 watt bulbs and 6 lunar lights] <-- good, bulb age?
1 hang on refugium with Maxijet 400 [never used] <-- nice to have
tank is not drilled, but if you plan on using a hang on overflow, I can also throw in a 20 or 30 gallon tank to use for a sump <--nice of him
$400 <-- minus stand/canopy ? No overflow

125 glass tank with dark wood stained stand and canopy <-- stand/canopy!
2x36" twin tube fl. lights <-- likely junk good for a fuge though
hang-on overflow with 15 gal sump
Cap 2200 return pump <--okay
Predator in sump skimmer <-- might be okay
Eheim 2 canister filter <-- dust collector/ebay it
4 powerheads <-- what kind?
heater
$400.00 <-- not bad for tank/stand and overflow

150 gal glass tank with black stand and canopy <--again stand/canopy
2x96 and 4x65 pc lights <-- could be useful, bulb age?
hang on overflow with 20 gal sump with tower
Pro Clear Aquatics in sump skimmer <-- might be oky
Cap 2200 return pump <--okay
4 powerheads <-- what kind?
heater
$550.00 <--not bad

150 all glass aquarium has dual overflow on it
large eshoppes wet dry <-- dustcollector
gen x 8500 pump <--nice pump
210 pounds of Carib sea aragamax sand <-- a quick $100 worth
4 T7 fixtures. <-- T7? never heard of them T8 or T5 maybe?
20 pounds give or take 3 to 5 pounds of live rock in there too. <-- a quick $100
Fish also can go if you want them. <-- reef safe or predators?
note there was small amount of salt creep that developed at edge of trim when first filled but quit after that, the tank has only had water in for appx 3 months. <-- recommend shooting the tank with an extra bead of silicone
600.00 obo <-- no stand or canaopy?


Maybe this will help a bit...