Pratim,
At the level of equipments you have now assembled, I think for any significant improvement of about 10%, you may have to spend perhaps double the amount on the particular component being upgraded. In addition, what sounds very good in my room may not necessarily turn out to be that good in your room. Having said that, I have had these speakers set up so far in 4 different rooms (in 4 different houses, in 3 continents, in all these 21 years, all rooms have been reasonably large), they never sounded horrible in any of these rooms.
Amit,
I have no idea about the current line of Canton speakers. I have not heard any of them. Vento is their current top of the line series, the Karat series comes next. I have a feeling (although I have read rave reviews for both these series), they would not come close to my speakers. You have to come and see these in person to understand their build quality, no modern speakers I have seen recently come anywhere near. My speakers were handmade and cost DM 2000 in 1989 in Germany (Cantons were and still are cheaper by far in Germany). They were at least about USD 2000 in 1989 in the US.
However, Canton currently has a reference line which may have similar quality (
The Reference - Handmade by CANTON | HOME). These are also handmade. They are no doubt expensive, starting with the reference 9.2 small bookshelves at USD 2000 per speaker (USD 4000 for a pair). Some of the reference series speakers are reviewed very very well by stereophile and other reputed places. The series numbers go up like 9.2, 7.2, 5.2, 3.2 and 1.2. The 3.2 cost USD 15 K. Until recently, Canton had a Aluminum/Manganese diaphragm tweeter on all their speakers (including mine). Currently they have changed that to ceramic/Aluminum/ceramic sandwich dome tweeter. As I have already said, I have heard none of these.
I do not think any of the dealers would have the Canton reference series for demo. I doubt if they would have even the Vento or the current Karat series (the current Karat series has no connection with Karat 60 that I have, their build is very different). They may have the entry level GLE or Ergo series.
Regards.