Most people around here will tell you to get a power rack and adjustable bench. Elite Fitness Systems (www.elitefts.com) stuff is supposed to be very high quality, and many people on these boards recommend that brand. I couldn't afford Elite, so I went with New York Barbell (www.newyorkbarbells.com), and I've been quite happy with my power rack. You can get accessories and attachments for the NY Barbell rack, including dip bars and cable attachments. There are other good brands out there if you do some searching.
It's also not a bad idea to have a lifting platform where you can do deadlift variations, O-lift variations, and other standing barbell work. Get a 4x8 piece of 3/4" plywood. put it on the floor. Get a 3/4" thick heavy duty rubber mat, in two pieces, each 2 feet wide and three or four feet long. (Again, I got my mat from NY Barbells; they sell a 4x6 mat that they will cut for you if you request it.) Put these on either side of the plywood. Now you have a solid wooden platform to stand on, and the barbell rests on the rubber mats, so you can drop the weight if you need to and it won't bang up the floor or your barbell. If you have space, you can put your lifting platform right in front of your power rack.