I have to cheat
I have three! The 217, 219 and 227.
the 217 is a brush everyone says is amazing and I was always like it can't be that good, then I got it and I don't understand how I lived without it.
the 219, I adore, it's great for placing colour in the outer V and crease, under your bottom lashes and smudging out eyeliner, it's pretty decent at blending but going over with the 217 gives me a great look, and the 217 is also good at placing colour
the 227, is amazing for placing a colour all over the lid, or highlighting the brow bone or cheek bones, but I also think it's like a big magic eraser for mistakes near the brow bone, it blends away this mistakes and makes my eyeshadow just fade into my highlight colour.
I'd probably say get the 217 and 219 if you can only get two, but if you can stretch it get the 227 too unless you have very small eyes as it's fairly big. I can't live without the 217 and 219, but I'd not want to be without the 227!
Hope this helps x