80,000 Gold Coins & Mamono Saibai:

My search for more good isekai manga continues, and these two qualify.

80,000 Gold Coins is by Funa, the author behind I Shall Survive Using Potions and I Said Make my Abilities Average.  I suppose it was only to be expected it would be good as well.  I especially like the beginning of this series, after that it sort of fades off, but it's still fun.

Mamono Saibai is a genuine manga, not a manga adaption of a light novel, but it's about isekai all the same.  This story jumps around a lot, between a fighting series, a cooking series, and a harem love comedy, but it has just enough interesting unique ideas to stay readable.

There's still plenty more isekai series to check out, but I'm going to prioritize volumes 5-8 of Lucky Star next, since they should all be past where the anime ended.  Hopefully the volumes are good and Lucky Star goes way up in my value added manga hall of fame rankings.