My Cd stuff is not as good as my LP sound. By a small margin. I still listen to mainly Cds, because i am really lazy. i can pop 5 disks into the changer and go all day long. When i play Lps, i have to be much more involved. So 90% of my time is CDs anyway.
The Lp sound is slightly cleaner and clearer, definitely more subtle dynamics in Lp playback. I just mostly like to listen to music, so I do not worry too much about CD vs LP.
When I want to listen to stuff i have on LP, then I play LPs.
====================================
On the other hand, When my system has left me not wanting to listen, past experience has shown it is something wrong with the system. I went from a Hafler DH110 preamp, to a Sony digital (first one) that had all sorts of (bells and whistles) stuff it could do. Problem was i stopped listening to music! So after wondering about what was wrong, i got rid of the Sony crap, and bought a Counterpoint Preamp, Loved that
The point being the Sony killed my interest. Without knowing why I just stopped listening, and only in reflection did i realize it was the sterile sound caused by the Sony.
So on that side i would say something in your current system you think is OK, really is crap, and you need to find what it is, and get something that pleases your 'inner ear' Your soul, your heart.
Getting an LP playback setup added to your system might solve the problem momentarily, but if the underlying problem is in the non CD portion of your setup, it is NOT going to solve the real issue, your setup leaves you unsatisfied. If you are lucky, and the only problem was in your CD setup, then you may be very happy to have added vinyl playback.
As for money to spend? $6 grand should be enough to buy a nice TT, with arm installed, and a decent cart, and a Phono pre. $1,000 to $1,600 used TT+arm, $700 to $1000 new cart, and a phono pre used $1,000 to $2,000
All new $6,000.
So you want a dollar amount $6,000 new, $4,500 used with a new cartridge.
================================
For ANYONE interested in LP playback: It is a FAD!! Everyone thinks "Should I?" Well, telling you straight up: NO! Unless you have a personal need to want to play records. It is going to be awaste of time. The hassles, and rituals of playing Lps get tired really fast!! Unless you have an inner need for them, skip the waste of time it will be, if you don't have need in your gut demanding to play LPs. I went back because i am nuts in general, and had nothing better to burn money on. (AND have a fantastic array of used vinyl locally) I am glad i did, because it add a new source of music for me. But as for if it is worth it... only you can decide. And the idea of a dollar amount to spend to reach what will please you, considering you are not happy with your system now...
Impossible.
This is my take on what you posted.
If i am wrong, i apologize. But IMO you should find out what is leaving you cold about your current system BEFORE jumping into Lps.
Whne You love your CD playback and THEN also want to play LPs.. well great!!!