I have a 100 lb barbell made by CAP. I purchased it at Dunhams Sporting Goods, I think it was $120, or so. Dunhams often offers 20% coupons. The ends are threaded but to be honest, I've never found it to be a problem. I like it because it holds more weight that the others. I don't consider myself to be and advanced lifter, but while doing STS there were a number of times that I used 80lbs or more. Just something to consider.
I've always wanted the Troy Lite Barbell. But I can't find a local retailer that sells them, and shipping is killer. I just got a basic one at a local sporting goods store. It's been great, and I've had it for 10+ years.
I have always used standard Olympic bars, plates, and I have a smaller EZ bar too. You'd have to get them at a specialty sporting goods store. They are not what Cathe uses, but they are heavy duty and will last forever. Getting these used is a great idea also, because they really don't wear out. Mine are all used. Craig's List Maybe?