Expensive, yes, but well worth it. As for bumper plates, they are nice to have, but I don't have them yet. A nice set is about $800. What I did instead, was get the wedgelock collars that ivanko makes for their bars. They really lock the plates well, and I didn't care about my floor as I also have 1 inch rubber.
As for DB training...I purchased the hex dumbells from 5lbs to 95lbs and just contacted Ivanko a few days ago to price out the pro DB's they make. I want something that will last after all the pounding they take when benching with them. They don't seem to make the cast hex DB's over 100 lbs.
Good Luck.
Here are the collars on the bar if interested.
