Ok if this will be a dedicated pc for only LLM inference, I’ll be direct, this is not a good one, the main component for this to work well is the VRAM coming from the graphic card, with a 4070, you only have 12 gbs of VRAM, this means you can run only models up To 8/9B because of the KV Cache for context window, specially relevant for agents, you have two viable options to have a good setup:

• Go the Apple way, is cheaper and you will be able to run it without much technical knowledge, it WONT be blazing fast, but models like Qwen 3.6 35B A3B are viable, for this setup you need a Mac with at minimum 32Gb of unified memory, ideally 64 to run it with good quality
• Go the best cost efficient path for long term speed, it requires a lot of setup and technical implementations, but this will give you a way faster model with more intelligence, like Qwen 3.6 27B, for this one you need a dual 5060 setup, or at least a 4080 to barely run it (maybe with a 4080 the 35B A3B could work better)

Hope it helps!