In your current setup, the sink is already sitting higher than the benchtop, so you’re familiar with how that looks and functions. There’s really no technical reason you’d need to replace the sink purely because of its height. Most modern stainless steel sinks are designed to sit flush or inset within the benchtop, but there’s no issue with retaining your existing one if you’re happy with its appearance and practicality. A new timber benchtop, whether solid rosewood or laminated acacia, can be installed in exactly the same way as your current laminate top, finishing neatly against the sink edge. You’ll still have that slight lip where the sink sits higher, but that’s more of an aesthetic consideration than a functional problem.
If you like how your current sink works and the extra stainless steel protection it provides, there’s no reason to change it. The main thing to ensure is proper sealing between the sink and benchtop to prevent moisture ingress.
Looking at the cabinet, it would be wise to add a bit of reinforcement under the corner where the new benchtop meets, particularly if you go with solid timber, which will be heavier than laminate. That might just mean adding a small support batten or vertical brace. Otherwise, either of your benchtop options should work fine. The rosewood will be heavier, while the laminated acacia panel you linked is lighter and easier to handle, making it a good, affordable alternative.
Please let me know if you have any questions.
Mitchell