Definitely not looking to spend that much. This will mostly be used to test out music to see if it is worth buying on vinyl and then playing some things I like that are not on vinyl. I'm not expecting this to come close to my vinyl setup, but would like something fairly decent otherwise I won't be motivated to use it.
In my opinion, your stated reason here puts a new bend on things and could save some dough. CD sound quality (in most cases) will be inferior to vinyl. It's all in the recording and mastering. The reverse is true if the source to vinyl is CD or bad digital.
Since your use is to test music you might want on vinyl and to listen to things not available on vinyl, you don't have to spend a bunch of money. You can easily get away with something such as a Marantz CD5005 or 6005 for example. You won't need to spend 4 digits on a CD player. Of course your free to spend and choose how you like, I'm just throwing an extra light on things. I'm not trying to push Marantz, it's just a good and convenient example for what I am saying.
Something like the Marantz example would be plenty decent in my opinion. If the CD player has a well implemented dac and the drive is well built, your good to go. (Most drives in CD players from the $300 level on up are good, not much to worry about). On the flip side having had a number of $100 to $200 players myself, I can tell you there is plenty to worry about with those.
Yes, it may not seem logical that a $300 player is that much better than a $$100 or $200 player, but that $100 can make a notable difference if you choose wisely. At least that's been my experience. Yours will be different. Example, some makes (like the Marantz) trickle down parts and build designs from their reference line into the line below. That adds good value for dollar.
In my opinion, a CD is going to sound like a CD, no amount of gear or money will change that. If the CD is mastered well and recorded with CD in mind it will sound pretty darn good on almost any player in the $300 and up range. If it is not done well, it will sound like a turd and you can't polish a turd. In other words, it will sound the same on a $300 or $400 player as it will a $3000 player.
Just my thoughts, worth about 2 cents on a good day.