Nothing against Maty but I think he tends to rely too much on measurements and not enough on what an amp actually sounds like. I'm pretty sure he hasn't heard the Dd120 or maybe any of the amps he's commented on in your thread.
The amp 100 is an amp I'm very familiar with. We have used them many times for whole house audio installations where each amp drives a pair of in wall or in ceiling speakers. We use them strictly for back ground music and nothing more. Probably any of the amps mentioned so far will sound more open, with more detail and clarity than what you are used to with your amp.
I don't think you can go wrong with one of these two amps and don't get caught up in measurements. Most of all enjoy your purchase. There's no reason to make it too hard. The reason I mentioned the Dd120 is it has some great features, the company has a good reputation for entry level hi end audio and the price is in your budget. Plus since it won an award it probably sounds pretty good. The NAD 3020 is an oldie but goody and it will smoke your audiosource amp, I have heard them both.