Upgrading to New Instrument

I’ve been playing a Kentucky KM-252 for a while now and I’m ready to upgrade.

I’m looking at the Kentucky KM-626 as a direct step up, but I’m also considering the Eastman MD515 or MD514. Also of note is that I can get the Kentucky wholesale for $700 plus shipping vs retail Eastman at around $1550. Mainly looking for a good instrument that I can get some years out of and be happy with.

Would the KM-626 be a significant enough jump in quality from my 252, or is the Eastman 500 series a much better long-term investment? I know people seem to like the Eastmans overall but at half the cost not sure if i should stick with the Kentucky. Also as a brownie point the Eastmans look better in my opinion.

I mostly play classical and Celtic music. If anyone has played both or knows about these, I’d love your input!