I've got a decent home gym. 90% of my equipment came from New York Barbells. Good stuff and shipping is included in most purchases.
By your actual weights from a local sporting good store (Sports Authority, Dick's, etc.) they ususally have 300lb oly sets for $99 ea.
When you are shopping for your flooring go to a Souther States, Tractor Supply or local feed store and ask for Horse Trailer mats (4'x6'x3/4" thick) usually $40 ea. This is alot thicker and 1/2 the price of "Gym flooring" yet is a better product.
Dumbells are expensive...
www.ironmaster.com is the best deal for a full set of dumbells @$750 for 10-120lb dumbells and they don't take up alot of room which is very important in a home gym.
Don't get a dedicated bench press machine. Use the rack and spend the money on a decent flat/incline bench ($300 is a good deal on a quality adjustable bench). Pay attention to the height of the bench in the flat position if it's too tall you will hate it.
Don't buy a power rack with a lat pull and dip station all together. Buy seperate pieces of equipment if you want quality.