In my opinion you could improve your sound quality in the manners you mentioned by upgrading to a better preamp. The question is how much do you have to spend to achieve the sound you desire.
Although I don't own a Channel Island Audio VPC-1 passive preamp, I have heard one and I feel it would be a great investment ($249) for you to make. I also think you would be very happy with the acoustic improvements. It should accomplish what you desire.
Check out: http://cgi.audiogon.com/cgi-bin/cl.pl?ddpreatran&1068250243&demo&3&4&
Regards
Although I don't own a Channel Island Audio VPC-1 passive preamp, I have heard one and I feel it would be a great investment ($249) for you to make. I also think you would be very happy with the acoustic improvements. It should accomplish what you desire.
Check out: http://cgi.audiogon.com/cgi-bin/cl.pl?ddpreatran&1068250243&demo&3&4&
Regards