I'm of the opinion that supplements do help, but that help is marginal. If diet is already half-way decent, any benefits from the addition of supplements will be hard to recognize. Supplements are not steroids.
The less you worry about supplements and the less you think of them as necessities, the better off you will be.
If you want supplements, I wouldn't stray to far from fish oil and a quality protein (just straight protein, no fillers or hardkore ingredients). The money can be used elsewhere... say buying good food and/or additional equipment.