pepsi uses ball lock, coke uses pin lock (or vise versa). it's the difference between a philips screw driver and a straight screw driver. neither one is really better, the point is that they are not compatible. ball lock is the most popular choice for homebrewers, so go with ball lock.
i would pay $25 for each keg, if it holds pressure and is easy to clean. the wort chiller looks like 3/8" x 20' copper pipe, but it looks a little old/used. i could make one new for $35, so i would pay $25 or less for it.
i called that box a "jockey box", but now i think it's another wort chiller, $80 new, so i'd pay less than half of that for a used one (if i actually wanted one).
i'm guessing a new tank and regulator would cost ~$100, so i'd half of that for one in used condition like that. $35 if the tank is expired and needs to be pressure tested, $50 if the date on the tank is still good.
so, $25 + $25 + $25 + $35 = $110, maybe a little more if i really wanted the stuff and was going to have to pay full retail to get it new.