Good decision. When I was looking for a second aircraft I considered the C-180, maybe a 172 taildragger with 180 Lyc, and the Decathlon. I lucked out - the Decathlon showed up first. It is an ideal second airplane. Fast enough, economical, comfortable, aerobatic.
It could only be better with a 160 C/S version. I get tired of putting gas in. The 150 C/S is nice, but burns almost as much as the 180.
I am almost sure I posted my problems with that little plug in the oil sump. If you lose oil pressure inverted, remind me and I will find my post.