I like Couturat et al.'s Ido even better. I can't "think" in it yet, but it is very regular and easy to learn. The main (irrational, personal) issue I have with it is the monotony of endings, -o is always a singular noun, etc. Plus it is Eurocentric. It does have pan-gender words like lu, saving having to say he/she/it. Tradeoffs.