When New Ideas Attack!

My current WIP is at 22,000 words. It's my first ever attempt at writing a book and to say it's been a long process so far is an understatement. What it has been is a learning experience about what helps me write faster, the fact that I'm a little more of a plotter than a pantser, that somehow keeping constant watch on my word count makes me move the story along faster, etc. etc.

What I didn't expect, and therefore wasn't prepared for, were all the great story ideas that would come to me while working on this book. I don't mean just those cute little snippets of ideas, I mean a fully fleshed out trilogy of books in a genre I hadn't expected to write in.

What's even worse? It's a fantastic idea. Even the hubby was like "Yeah. Why aren't you writing that story?" Gee thanks! My poor WIP is feeling a little shabby now.

Somehow, this new story idea is making me feel like I need to jazz A Passion to Protect up a little. I knew it needed something more to it but it's supposed to be a Contemporary Romantic Suspense and I shouldn't be comparing it to the Paranormal Romance idea I have. Both have their specific world-building, setting and characters but the paranormal idea is starting to seem so much more exciting to me. Not good.

I've kept some notes on the new idea so it will be there when I'm done with the WIP, but I'm wondering how do I focus back on my current story? So, I'm wondering how do other writers keep new story ideas at bay? How do you keep the excitement on your current project?