If you want to be more flexible with your guests, pay attention to the leg width and where the legs are placed. In general, a table with thinner legs, or where the legs are at the corners, will make it easier to squeeze an extra chair in.
It is likely that you will take the new items with you and so it wont be a wasted spend and could end up selling your home if it helps to make the room appeal to buyers. If you dont take them with you and the buyers like the space, you could offer to sell them - this is particularly handy for first-time buyers.
Consider a designer pack-and-go dining table. Plywood is lightweight and durable, and a plywood table can be flat-packed and assembled as needed at home. Your dining table then can be packed up and moved as necessary. Plus it works well in a home with modern Nordic or contemporary Asian style.
Solid wood is a classic material because it is durable and easy to repair. Pine, acacia, mango and teak are popular, less expensive options. “Solid wood is the most popular, though it’s often the most expensive