Lights
Here's a 20-sec 1.5MB video of mine.
It's a Sunbeam Meteor Light and a NZXT 120mm blue fan basically.
And it isn't sound reactive... yet. It just kinda looks like it. The video is me manually cycling through settings, there are 8 of them but I use the last one.
I would recommend that if you just want game performance and don't really go to LAN parties like I do, then I would recommend you STOP right now on buying lights. I have done this and spent over 200 dollars in makeing my computer look good without adding any cooling or performance. It was a great mistake on my part and I would just like to warn you. Just on a personal note I would suggest Flat black case with no window and a load of Panflo fans (120mm of course)
I probably spent about 30 dollars trying to make my case look good, which included 2 sets of cold cathode tubes. the first set was red, and the second were UV. I'm back to the red ones because the UV's burned out.
I have that as a function already. The three fans are modded by the guy and due to that Fan controller frying (The fan was flashing still), I took the rewiring and all three blue led fans are on that same 3-pin connector.