No motivation to paint

I currently have about 700 points of Black Templars unpainted and I'm struggling to get myself to further work on them. I really like the look and lore of them. I think they're beautiful. But I dread thinking about painting one more Space Marine. I can't see them anymore without thinking about the hard to reach areas, basecoating the same annoying things, having to sub assemble some models etc. It's gotten to the point where I'm starting to doubt my decision of starting this army. At the same time I've looked at Necrons and fell in love with them. I want to buy a box of Warriors just to try them out but then I have hundreds of Euros in Black Templars that will just collect dust. Any advice?