[FlyACL]

There are ones out there. The Nyko one as you mentioned. There are also stands that have fans in them as well. Aside from the Internet stories that say the Nyko one can scorch your 360 at the plug. Most of the talk seems to be centered around "stealing" power from the 360 to run the fans. I haven't done much research on this subject (because my Nyco Inter-cooler has been fine) but I would look for something that does not plug into the 360, but rather has its own power source. If you can't find that then my second choice would be one that is USB powered.

To be honest however, if it is in a well ventilated place and you are not experiencing any major problems. I don't think you really need to be concerned. It was designed to run without these attachments. Although, I do understand the need to feel like you should do something about it.

Good luck~

By the way I notice you are new here so Welcome to the site! If you get a chance check out the podcast. It is a great show full of good info. You can download it from links on the front page or get it from iTunes.