USB Light: http://www.elationlighting.com...xtSearch=USB%20Light
As far as a i case i would assume so but i have never used one or looked for one. yes it is rack mountable.
Sincerely,
Not fast enough Jim 
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dammit! i was on the phone too doin compu live support :P
Get rid of your chauvets, and replace them with adj lights. Im in no way kissing butt, bit the fact is, chauvets are way too dim. If you dont have much to spend, then get some used adj lights with some sort of mic on them. If you are like me, then using a dmx and doing whatever it is you do at the same time just breaks your concentration too much. Maybe a light pad with a chase and turn the light on znd off as you se fit. I for one have too many things on my mind while I play ( leaning serato and i get very fraustrted ). I myself would like to know how to use a dmx controller, but I can't even get my serato to work properly. anyhow, I hope this was atleast somewhat entertaining to say the least, and good luck with whatever you choose to go with.
Hey Los, I agree with you, the Chauvets have been a pain! I finally got them working and now they are staying until I can get something better, but I do like them for what I am doing (for now). The 192 kicks butt! I used it this weekend and it was awesome.