My PC, like the previous one, has 16 GB and I'm using it both for gaming and development, including IDE, Android emulator and VirtualBox for Linux tests (both using a fair share of RAM), sometimes running a few servers on the VM. Games are usually not really demanding (normal games) but it can be a flight sim, those are the most demanding in every aspect.
Every now and then I have to use the IDE, the emulator and the VM at the same time, but I've never had any issue. Perhaps some of the RAM is occasionally moved to the swap but I never noticed. Of course it's a question of basic hygiene, when I don't need a hungry program anymore, I'm usually closing it. I've also removed as much of the pre-installed bloatware as I could, and the unnecessary services.
So I think that if I had to buy a new PC right now, I'd buy two 8-GB and keep 2 free slots for later, I'd set a fixed-sized swap of 12 or 16 GB, and save the 200 Euros for something I really need.
On pre-built PCs, the difference may not be that much, so if you don't want to bother with that, 32 GB isn't a bad idea.