I took the fast way out and bought the starter kit, plus plyobox, on www.crossfitequipment.com
for around $1k. From there, I've added rubber mats for $160, built a pull up station for three with a spot for rings ($100), good jump rope($20) and a couple regular 45# plates ($50) I have ordered squat rack and bench ($350)
Total Approximately $1600+
was easy to deal with.