Will there be a dramatic difference?

I really appreciate the responses. And I am definitely going to make the jump. I do have one more question as far as difference in quality is concerned. Parasound also makes as. audiotroy posted the halo JC5. Anybody have an opinion on whether or not that would would be worth an extra $2000 on top of an already big improvement? $2000 seems like a lot considering the great reviews the A21+ already has.

"@audiotroy  we are a parasound dealer theA21 is a good amp you want a jc5 which is a much better amplifier then the 21"

I think this is accurate from what I know.

At the moment, I just can’t spend an extra two grand. I went ahead and ordered the A21+. In the future when I have some extra money, I will probably sell that one and upgrade. However, until then I’m sure the improvement from what I am currently running to the A21+ should be amazing and satisfy my listening needs for a little while anyway.

It is a decent step up but to make better there are 1 main fuse and 4 -2 per channel fuses on the power rails  that I would at least replace with Hifi tuning  fuses

Can you tell me what size fuses and where to get these?