Also, if you are really into it, I would recommend a proper bar and weights. 45lb BB, and 45/35/25/10/5/2.5 weights. I picked up 300lbs of weights for $100 a few years ago, I'm sure you can find the same. Also, for ~$180 you can pick up a bench press with multiple levels (incline, decline, flat, shoulder). The arms will rise with the bench height and can be used as a squat rack. Mine also had a preacher curl & leg extension/curls. Would be your best bet. Curl bars are cheap (35lbs) and would give your everything you need.
How much weight do you currently have? At most, you should be hitting each muscle group twice a week (excluding abs and calves), but if done properly, once would be sufficient.