(sorry for my english) Go to the sampler direction. If you like the dark-ambient drone side of the music, expecially. If you like the noise side of it, experiment with distortion and looper pedals. I think it's not necessary any particular synth or magic box. Sometimes is just a matter of "marketing", always there are some gear that's more trendy for some time: there was the time of eurorack, the time of Teenage OP1, Lyra8, Elektron and more... Personally, I think there is not any synth that give you all tones you need, nor the better equipment to start. Industrial, (dark)ambient, drone, noise, power-electronics, are all type of music genres that they are all based to sound experimentation. Considering the most important monikers of these genres, very few of them plays with expensive walls of synthesizers... Lustmord declared he sold all of his hardware gears early and he found the best toolset to a Mac Pro... He compose and plays his music with a common Logic Pro, Altivec XL reverb and tons of samples of course. Merzbow make his noise with a large setup of cheaper pedals, a Mac and a strange selfmade string instrument as "detonator"... If you got a computer, start buying a good soundcard or (better) an analog mixer, the most possible better (for your budget) speakers, a digital recorder too and starts to experiment with them: synth, pedals, racks and more eventually they come to you without thinking so much... Just my modest opinion.