The tool without which it is impossible to build models is a drill. It's the first thing to buy in a workshop. After all, all the drilling, cutting grinding processes that sometimes can not even be done manually. It is also very useful to have a drill rig with this device, and you can perform some milling work. In some cases, you will also need a flexible shaft as another upgrade for the boom machine.
I have learned from my own experience that buying Chinese analogues is money for the wind. While using such Chinese device, all the time I thought that my hands were growing so that nothing could be drilled or cut off. But when I picked up a good tool, I felt like a person.
I got myself a powerful, high-precision German who can work for a long time without shutting down. I have more compact options and lighter ones. Instead of collets with cartridges ... Just in case and a flexible shaft, I also bought, but I use them very rarely. I do all the work directly with the machine. It fits comfortably in your hand and you can reach all corners of the deck if you forget to drill something in advance. Precision drilling equipment is the first thing you notice after a Chinese.
My bor-machine is 220V, so it has high power and is rated for load. I advise you to buy one as a basic hand-held power tool ...