Best integrated amps

No. Not worth the change. Listen to ghdprentice. You're not going to find anything better for $300. NAD 3020 is a classic. You'd have to spend a lot more to out perform it.

What are your sources and speakers? Keep the 3020 and focus on those if you really want to hear a difference.

If you can swing $600, get a Denon PMA-2000. The original. It has a light gold color anodizing. A great amp in my opinion. This amp will pretty much drive any speaker, and won't need a rebuild.

What speakers are you using?  
 

You’d be surprised what you can find….

I built my own speakers with some visaton w250-s, SB acoustics SB 12 and a SB 29

Check out Derek Sanderson’s creations - search Fleawatt blog.  I’ve owned several of his Fleawatts over the past several years and have given a number of them away to family members.  Have always loved his designs.