braudio7 - Let me get this straight. Either improve your existing system or add a second system? If so that's a question only you can answer but I at one time thought I would go with a small second system. The more I thought about it I decided to go for just one great system. The reason is, would I be disappointed with the second system compared to the first. Probably so I decided on one system.
That said, I'm in the speaker first camp when building a system. Because all speakers will have a 'house' sound. Find the one house sound you like the best. From there I think you'll find several amps that mate well with them. I started with a Denon integrated ($400) and mission/cyrus speakers ($800). Sounded great but when I got the itch to upgrade I got the Bryston B100sst ($5k). I was having some minor issues with the Denon. Well to my surprise I had to 'squint' to hear the improvements. But since the speakers were 20 yrs old a couple of years later I decided to start looking at new speakers mainly for more bass and clarity. After listening to quite a few I thought it would be best to bring my speakers with to demo against the ones I thought I liked. To my amazement I liked the mids of my original speakers more than most others. It wasn't until I heard the Sonus Faber Creamora auditors I said WOW. They did everything better and since they were outside my budget at the time I kept looking. Then I heard the Dynaudio C1's. Same price as the SF's and similar sound but the Dyn's were even better from top to bottom. So I bought them. Later I thought of trying tubes. So my local dealer brought over an Octave V70se for me to demo. In less than 5 min I was so impressed with the 'control' of the music I pulled the trigger. Also I didn't realize how dry sounding the Bryston was and thinking that if I were to want to change up the sound I could start swapping tubes. Never thought I would get rid of the Dyn's because they had the sound I really loved. Then one day I heard Raidho Diamond series. I couldn't believe what I was hearing. It took me many months to try and get that sound out of my head. My system sounded just wrong after that. Yes I did get the Raidho's and replaced the Octave because it really fell apart at the highest listening levels.
YMMV
Good luck whichever you decide
That said, I'm in the speaker first camp when building a system. Because all speakers will have a 'house' sound. Find the one house sound you like the best. From there I think you'll find several amps that mate well with them. I started with a Denon integrated ($400) and mission/cyrus speakers ($800). Sounded great but when I got the itch to upgrade I got the Bryston B100sst ($5k). I was having some minor issues with the Denon. Well to my surprise I had to 'squint' to hear the improvements. But since the speakers were 20 yrs old a couple of years later I decided to start looking at new speakers mainly for more bass and clarity. After listening to quite a few I thought it would be best to bring my speakers with to demo against the ones I thought I liked. To my amazement I liked the mids of my original speakers more than most others. It wasn't until I heard the Sonus Faber Creamora auditors I said WOW. They did everything better and since they were outside my budget at the time I kept looking. Then I heard the Dynaudio C1's. Same price as the SF's and similar sound but the Dyn's were even better from top to bottom. So I bought them. Later I thought of trying tubes. So my local dealer brought over an Octave V70se for me to demo. In less than 5 min I was so impressed with the 'control' of the music I pulled the trigger. Also I didn't realize how dry sounding the Bryston was and thinking that if I were to want to change up the sound I could start swapping tubes. Never thought I would get rid of the Dyn's because they had the sound I really loved. Then one day I heard Raidho Diamond series. I couldn't believe what I was hearing. It took me many months to try and get that sound out of my head. My system sounded just wrong after that. Yes I did get the Raidho's and replaced the Octave because it really fell apart at the highest listening levels.
YMMV
Good luck whichever you decide