Use a good multi 2xDay, liver tabs(cheap and effective), Grow!, caffeine, and Methoxy -7 (at the max dosage). So basically, you want vitamins, high quality protein, a pre-workout stimulant and something anabolic.
Before you buy any supplement check at the ingredients and look for whatever may make it 'special'. With Nitro-tech, they put creatine in it. Thats why it 'looks' like you're building muscle while on it. With Cell-Tech, it makes you look big cause of the sugar loading you go through, filling your muscles with glycogen. Oatmeal will do the same thing and its a HELL OF A LOT CHEAPER and its pretty damn hard to get fat off oatmeal.