I'm going to ask a few questions about separates so bear with me here. I know zero or very little, other than what I've read. I'm looking at the Outlaw website and I'm concluding that I would buy for example, the 7125 amplifier to go with the 990 preamp/processor. I'm assuming:: aaarrrggghhh!!! 1. That's all I need?? 2. These 2 pieces replace my current Denon 2105? 3. Is there a way to buy one piece-the amp-and continue to use my Denon? 4. If so, Is there an advantage or disadvantage?? Those of you who have the separates, had at one time receivers, so you understand the dilema and confusion and hesitancy!!! Thanks.