You'll notice the speed increase from the SSD way more than you will from the CPU.
Alternatively, get the CPU upgrade and wait a few months to purchase the SSD when prices are cheaper? We all like the best of both worlds lol 😛
That is my plan at any rate, going to wait till around end of summer to get a SSD once I see how the prices are. Aiming for 256GB or 512GB personally. Then wait till a year or two down the line and extend to 8GB ram when I feel I'll actually need it.