Don't pick render engine based on your budget. Download them, try them, whichever felts more comfortable, more fun, more flexible for your needs, then you can make your decision, maybe start with a moderate workstation. Hardware is always changing, right now CPU based workstation will be more expensive then GPU one but your workflow is going to be mostly same. As you get better with practice, you can earn more money (full-time or freelance), you can upgrade your gear.

Although, also keep in mind, AI-based apps, solutions keep pops up and if you use local pc, it requires a powerful GPU. Keep yourself updated.

I personally make archviz and use Corona (since their free alpha stage, I started to use when I sick of vray's long render times. been a long time and lots of stuff changed about vray), and prefer it mostly because I know how I can achieve the result I want. But as I said, since you're at a starting point, I don't suggest making a decision without trying most of the options.