Your best bet is to find a gym thats going out of biz then you can buy everything for pennies on a dollar. I just bought more com equipment last week i picked up a body master crossover, polaris leg ext, leg curl , 45 leg press 2000 lb cap, bicep machine,
back row machine ,120 - 140 lb dumbells and a mean t-bar for 5000.00$ Now i have a fine home gym,i already had alot of other com equipment and the best thing is i'm open 24 hours aday even open on holidays If i totaled everything up it would def be close to 50.000$ worth if i had to buy it new and i might have 1/3 of that in it not counting the building.
If you only can buy one machine, get this one: http://www.southernxercise.com/trusquat.htm
It is by far the finest leg machine I've ever used, Every bit as effective as squatting imo, esp for taller athletes.