Check ebay for the knock Arri fresnels. Often these are listed as "like arri." You can get these pretty cheap and they are decent. I've used the 300 watt variety on a couple small shoots but you can pick up the 600 watt versions as well.

With hard tungsten light like this you can go soft, but you can't go hard with soft light.

You have to be careful with LED because sometimes the cheap ones just don't produce the right color of light.