Nice! The purple one never came out over here and I couldn't be bothered to import a redeco, so I stuck with the grey one, who did make it over here, but about a year later than his U.S release!
You should! It probably won't replace Geki as your favorite, but if you can get past the wackiness Go-onger is a really solid show. I think its main strength is how likable the entire cast is.
I can understand that sentiment. For many of my favorite series, such as Shinkenger, Magiranger and Gokaiger I'm usually not a fan of everyone, and for all three series I'm not a fan of the Blue Ranger. Even Go-onger, where I like everyone decently, Renn is my least favorite character. In that respect Retsu was a big surprised at how interesting he is.
That's cool! Gou is pretty cool, but I'm guessing there's more backstory to him than what is shown now. So in the meantime, I have to say my favorite of the 5 is Retsu. I love his style, his focus on grace and beauty over raw power and I like how he initially looked like the bad boy of the group but was revealed to be the most gentle of the three.