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.
Marble is a big investment, but without exception marble dining tables are nearly always showstoppers. Tables crafted from quality imported marble are extremely beautiful.
If you want a table to last through years of dinner party wear and tear, choose a table made from a hardwood, such as mahogany, walnut, maple, oak and teak. Tables made from engineered or composite woods, which include plywoods and MDF, are durable and economical but are never as strong as a hardwood.
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.