I owned a 6450 for about 1 year. I would suggest some other upgrades to bring your system to a similar component level. While you are doing this get out and listen to some other brands and some tube amps too.
The 6450 is good, better for me IMO than the 6300 because it has nice controls to fill in if the CD is flat or if you want a little more body.
I think you will have to spend an additional 1k on an amp after you sell the 6450 to make much difference and perhaps $500 on a cd player, maybe an Apollo or something. Can you be more specific about what you want to hear differently in your system?
The 6450 is good, better for me IMO than the 6300 because it has nice controls to fill in if the CD is flat or if you want a little more body.
I think you will have to spend an additional 1k on an amp after you sell the 6450 to make much difference and perhaps $500 on a cd player, maybe an Apollo or something. Can you be more specific about what you want to hear differently in your system?