Rich: User Evan has both. Try sending him a PM. I'm surprised he hasn't chimed in.
I'm here, I'm here. I've been at the race shop all day long, just glanced over the forums now.
In outright sound quality, the 3000-2 would be my pick. Things like transparency are more dependant on the speaker in your system.
Like Rich suggests, the details of the system are really a deciding factor here. My 4500 is pushing a highly integrated multi-amp setup with almost 30 drivers - it is a very versatile machine. The 4500 can be used with a remote and has datalink for controlling sources as well.
If you are listening directly to the amplifier, the 3000-2 wins but the 4500 isn't far behind. In short, I would buy both!