Center channel speaker recommendations

Yeah the LS50 is a great choice with the Dayton amp, or their center speaker from their R-series is on sale for the same price...
https://www.kefdirect.com/home-theater/home-theater-separates/center-channel-speakers/r200c-center-c...

One of those is the way I’d go, but if you’d prefer self-powered here’s one a little above your price others here have reviewed positively, and with its professional roots you should get plenty of clarity...
https://www.amazon.com/Adam-Audio-A77X-Powered-Monitor/dp/B006TDQPKQ

On the lower end of the price spectrum and if it can work in your setup, my brother uses this as his self-powered, wireless center channel and it works surprisingly well. You just need to use it with their $29 stands or put blutack (or something) under it as I find it doesn’t sound its best sitting directly on a hard surface. At $179 for a refurbished unit (I bought my brother's refurbished and it was perfect) I’d think this might be worth a shot especially if this is only an interim solution, and you have 30 days to audition so you can return if it doesn't work out (although you’d have to cover return shipping).
https://audioengineusa.com/shop/factory-refurbished/b2-wireless-speaker-refurbished/

Hope this gives you a few more viable options, and best of luck in whatever you choose.

Hi soix, sorry to keep disagreeing with you.  ugh, sorry.
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I heard the audioengine monitors at RMAF and actually was not impressed at all.  They really sounded like low cost computer speakers and I think you could do so much better.  This is nowhere near the sound quality of the LS50.

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The Adam monitors could be an interesting choice, but the ribbon tweeter is definitely going to have a different sonic signature than the KEFs.  If we are looking at powered monitors for cheap, I would actually get a normal old Yamaha HS5 single (you can get them for $199).  In my opinion, the Yamaha are most natural and pleasing of the monitors.  They will not be an exact match with the LS50, but they will be a lot closer than either the audioengine or adam monitors.
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The R200C center is a great suggestion, however. lol

The Emotiva C2 is supposed to be one hell of a center channel for the money based on what I've researched, Check it out:

https://emotiva.com/collections/loudspeakers/products/airmotiv-c2

Thanks for the recommendations. I thought I had the issue resolved when I had a local deal for a Kef R600c speaker but the seller damaged the speaker getting it out of storage.