First 5* unit advice

I was planning on buying my first 5*, and I need advice on which one to get.

Which of these 5* units would be the most useful in the long run?

-Ficta
-Bernard
-Bernhard
-Ignat
-Joachim
-Lily
-Sheryl
-Sofia

I'm open to suggestions other than these ones as long as the unit isn't too expensive.

I'm also wondering how much a fresh 4* Xiahou Dun is worth.

i would say go for sofia since she has high raw stats with only 15dc. she will make training events slightly easier for you since only attack boost skills work during boss battles. training events are an easy source for free 5*s/6*s provided you put enough time into them.

What do you mean by training event?

Some events replace your Training section with event areas instead of the regular chapters and there are other events that use Training Points and act like a second training section.

If you can, I would keep Xiahou Dun, at lvl100, he has almost 5* stats, good speed with Knockback.

But have you looked into Lev? I think thats the 5* I would invest into.
And how much are you willing to spend? With the market right now, 6* prices are dropping REALLY quickly.

Thanks for the advice guys. I actually settled for Sofia. Hopefully she will help me out in the events.

I was actually looking into some of the better 5* like Lev, but they turned out to be more than I could afford. My budget was only around 5te.