I think you would be fine to just get an adjustable bench and a power cage. Leg extensions & leg curls are nice and all, but not necessary. I think I have done them two or three times in the past 5 years or more. You can probably do pull ups on the power cage.

Also, the first thing I thought of when I saw that link was the bench at my parents' house (because it's yellow also). Don't buy one unless you have tried it out. The bench at their house sits at least 6" higher than a normal bench. My toes barely touch the floor when I lay down. You have to stack shit on the floor to put your feet on for leverage...it sucks.

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