The only real consideration in buying this style of table is whether to go for an upmarket one, such as a French colonial table, or one with the rustic appeal of an English country farmhouse.
If you fall in love with a metal or marble table, don’t be discouraged from buying it, but do think about how you might safely transport it. As suggested above, choose a small, round marble table, or go for a wooden table with detachable legs.
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.
If you have an outdated dining table and chairs, it may be worth investing in some new furniture to help present the room in the best way.