The iPhone 8 Plus may still be a decent option if you're on a tight budget, but it's worth considering a few things. While it can run the latest iOS updates, keep in mind that hardware limitations mean it won't keep up with performance improvements seen in newer models. Battery life might also be a concern if you're buying used, as older devices often have reduced battery capacity.
For day-to-day tasks, it should perform reasonably well, but if camera quality is a priority, newer models will offer much better results. You might want to look into slightly newer models like the iPhone SE (second or third generation) or even the iPhone XR for a better balance of performance, camera, and longevity. They tend to offer more bang for your buck without breaking the bank.