Generally you are going to pay more in upfront cost with the LED but the ongoing cost is lower. Never have to replace bulbs and they are more efficient so less energy spent on cooling ect.
I Built my lights around the samsung H series in 2 foot lengths. I could have done it cheaper overall but i wanted flexability of changing spaces and i run mine at 700ma so they are not hot to touch.
The flower lights are 4 seperate lights each covering a 2x2 area each with their own driver for 4 lights in a 4x4. For strips and driver was $150usd. I spent probably another $50 approx on each for wiring, frame ect. Overall i paid around just over $1 a watt for what i built but with different choices if budget was the only concern i could have easily done it under $1 a watt.
I am 2 weeks from my first chop with these and couldnt be happier with the lights, you will definately be happy with anything based on the samsung 561c diodes.