Looks like a nice frame from the specs and reviews (I never heard of this brand before) I do like the geo on the 60cm, usually with my height / long legs gravel bikes end up with more saddle to bar drop than a pro time trials bike.
Another idea would be a direct from manufacture gravel frame/fork. 99.5% of these bikes roll off the same factory floors so why not buy your bike from the same place that brands buy their product ? Carbonda and ICAN are two that come to mind, tons of people riding them and every possible detail has been covered online in forums and youtube so not much of a risk at this point.
I have had the Carbonda 696 for several years ($650 and well over 8000 miles) the more race focused model is called the Carbonda CFR707 (at $750 or so)