I would prefer to have GPUs for under $600 if possible
Unfortunately not possible for a new nvidia card (you want CUDA) with 16GB VRAM. You can get them for ~$750 if you’re patient. This deal was available for awhile earlier today:
https://us-store.msi.com/Graphics-Cards/NVIDIA-GPU/GeForce-RTX-50-Series/GeForce-RTX-5070-Ti-16G-SHADOW-3X-OC
Or you could try to find a 16GB 4070Ti Super like I got. It runs Deepseek 14B and stuff like Stable Diffusion no problem.
With drip machines the trick is finding one that gets the water hot enough for proper extraction. Most of them do not. As mentioned elsewhere in the thread, the Mocca Master is the gold standard here, but it’s expensive.
Of course, the easiest way to get boiling water is with a kettle, and if you can forego the convenience of a drip machine there are a bunch of brewing methods where you supply the water. The French press, the Aeropress and the Hairo V60 pour-over are popular options.
The main thing, though, if you’re serious about the flavor of your coffee, is to grind your own beans.