No worries Abby! 
I’ll have to check locally for the Leonardo and see if I get lucky since it was a limited edition. But so was the Einstein and others which are still plentiful? But, like you said, there’s still plenty of colors! I like Antietam. A rusty’ish color with some shading although I haven’t really used it much so far.
The thing I like about Noodler’s is the option of getting bulletproof colors that won’t wash off if they get wet or fade in UV etc. over long periods of time. Of course Noodler’s talks of them for anti-forgery against bleach, acetone, and the check/document thieves tricks. El Lawrence was an interesting bulletproof color many have said looks like used motor oil. I got some Rachmaninoff for my wife and it is one of the brightest and richest pink inks I’ve seen. It’s bulletproof too although a bit thick and dries up in the feed quickly along with getting thicker in the pen over time. Luckily it rinses out easily and doesn’t stain up your pen or converters.