Have in mind Apple is transitioning Mac to ARM too. This year we might see some of the less powerful machines equipped with the first version of their ARM Macs.
I advise you to wait for them to launch the entire product line with Apple Silicon, see the performance, the price, etc.
Plus, an 512GB SSD is like what 50 bucks? Don't go for 16GB, go for just 8 and it'll be like 60 bucks or so. It's a good value and you'll be happy while Apple Silicon takes place. Once transition is done you'll have the benchmarks, real life performance info, specs, consolidation of the hardware.
Oh, If you absolutely need Windows, just buy an Intel Mac now and you're good to go.