Iuse the Troy Lite system from fitnessfirst.com, it is excellent, but more expewnsive than the escalada sports one Cathe sues.
You might look at the weight of the bar alone, the coating on the plates, the different weight sizes the plates are divided into, the types of clips used and see what works for you. The Troy lite bar weighs 5 pounds only, it gives 10, 7 and half, 5 and 2 and half pound plates and I find this suits me for every muscle from quads down to triceps and biceps.
It costs around $100 with shipping, at least it did last January.
Clare