Looking good, man; I love the purple. I think it may be a bit too dark in places, but otherwise great work.
I really like your color scheme...I liked the images you had in the background, but in these renders you can't really see them :(
Ask yourself: "What do I want them to look at?" Thats where you concentrate your lights, thats where you concentrate your color. Thats what you work on the most and thats what you develop first. Right now, I am looking at everything BUT the alter-area, which is where I suspect you are concentrating on. Here's how I light a room for visual intensity: http://andrewklein.net/bh/hardsurfaceweek10.htmlTake one of your renders into Photoshop and use the magic wand tool: turn the contiguous setting off and set a tolerance of about 30. Click on a white area. Copy this and paste it into a new layer. Now click on a dark area. Copy and paste this into a new layer. Now, delete out the rest of your image. Where white touches black is where our eyes fill go first. Where does white touch black in your image? With that in mind, you now know where to set up your lights.
I still think adding some neon lights to those front towers would make the room pop. Since their is already so much purple try creating some yellow or orange glow it will really make the visuals pop and stand out because the colors compliment themselves.