↑Understood. Wouldn't you want to still have your subwoofer hooked up? I'm guessing you are setting your center to small and crossover somewhere around 80Hz.
I don't see where you have stated what speakers you have in your system. If you list the speakers, I'm sure there will be someone on here that has the same, had the same, or similar and may be able to make a more directed recommendation. If you were to list your speakers and 99.9 of people say they have experienced them and they are garbage, that would be a good indicator....on the other hand if 99.9 say they are great, that is also an indicator. Just playing the center speaker alone really gives you nothing to compare it to.....unless you have multiple center speakers that you will test individually and even then relying on what "your" ears thought they heard from the previous speakers.
Keeping in mind the center is your main "dialog" speaker, this where you want it to definitely excel. I personally would be testing to see how my center compares to my fronts......or vice a versa, if I'm thinking my fronts are the weak link.
Here is an imaginary example: I have Klipsch RP280F fronts and a (name your brand, could be Klipsch) center. The center does not seem to be able to compliment the fronts. I would now test/purchase another center, let's say the Klipsch RP450c and it sounds absolutely amazing with the fronts.
Another way to solve the dilemma is to have the same three speakers (brand and model) as fronts and centers.
It sounds like you are planning to purchase, so may as well decide if it will be just a center or fronts, or possibly both center and fronts.
Oh, I forgot to mention the center "never" performs entirely on its on in movies, so why set that parameter. In movies, again I state the center is typically your main dialog speaker, with the other speakers carrying the rest of the load except when scenes are steered directly to the centers.