I have a pretty simple home setup. I nabbed a cage/safety squat rack when a gym in my area went under. I went to a local gym equipment dealer and grabbed a nice bench to throw in with it that works for everything from bench to shoulder presses. I think i got the cage for 100 bucks. Best 100 bucks i have ever, or probably will ever spend.
I nabbed around 900 pounds of plates across 10 years as needed and picked up 2 texas bars after bending 2 standard bars. The Texas bars are rated at 800 pounds or so. I have a while to worry about that just yet. 620 is as much as i've ever had on them and i barely get a bend on them. I think they go for around 200 a piece, but well worth it. I am pretty sure they will outlast me.
With the cage, bench and bar i can get done pretty much all i need to do in my house without dealing with people. By people i mean the guys who work out in dress shoes, the occasional button up, or who change the radio station to whatever Justin Bieber is currently on.