I bought the original Lauf True Grit in 2017 and put over 35k miles on it, including 3 Unbound 200’s (DK). Fantastic bike and great people that own and run Lauf - both here in the states (Jeremy) and the people in Iceland. Highly recommend. Lauf is probably the best value in a gravel today.
I upgraded to the Seigla this year for the larger tire clearance (I run Rene Herse 700x44 and 700x48 for gravel and 700x55 for bike packing).
As for the fork, I have the Grit fork and love it - especially when things get a little rough and rocky, such as minimum maintenance roads, ATV trails, etc. However, if most of your riding is on smooth gravel, paths and paved roads, then the rigid fork is great. Bigger tires (45+) at lower PSI are going to give you some squish anyway. If I were trying to save some money, I’d probably buy the rigid and get one of the wireless builds.