Presumably you Like your M457 , so that's your baseline .
Yes , FN are fine pistols. (And l am currently grooving with .40 caliber ) That said , you would have to try really hard to not think it is duplicating the M457 .
Added - only real difference is 14rd vs 7rd . Big deal for some , others more ho hum . If your current favorite is a 7+1 , and you like it , it's probably not a major priority for you
Less than 3oz weight difference, 1/4 inch bbl difference, both calibers starting with a "4" . ( Without gratitously reigniting the caliber wars , the performance of my preferred. 40 loads , are overlapping into decent .45acp load territories. )
Bersa are under rated . Not as nice as HK , but good enough , and good value .
The TPR 9C is another 3 Oz lighter , and cumulatively 6 Oz is meaningful difference, plus smaller still .
It sounds weird to recommend a Bersa over an H&K , especially when the asked didn't set $ as a major priority. But it is enough difference from your existing baseline gun to be a seperate thing . Plus gets you into the 9mm world .
( If you can hang with single action hammer fired , also look at S&W CSX - E .)