I wanted an olympic setup at that is what i have used in the gym for the past few years. it is the most expensive but the best equipment.
I have got an Olympic barbell for about £60. This is 20kg on its own with 2 inch/5cm diameter ends for the weights.
Olympic barbell weights cost me £180 but i got a good deal off ebay (All 2inch/5cm holes). Some guy who had his own commercial gym was selling off some old weights. they were of random type (Some rubber, some tall, some solid, some not. But i managed to get 2 x 25ks, 4 x 15kg, 2 x 10kg, 8 x 5kg, 10 x 2.5kg, 10 x 1,25kg. The 2 x 25kg would have set me back £100 on their own.
As i got so many small weights i picked up two olympic dumbells for £50.
I also managed to get a basic bench with a plastic barbell and weights set up for £30 off ebay. this will be good for doing warm ups and special work out routines like BodyRock. I got Cass a BodyRock sandbag thing for xmas too which is a good weight tool.