Alternatively, if you just want to get the water marks out of the wood: Set an iron to warm (not hot) and allow it to heat. Lay a cotton napkin or tee shirt over the water stain. Iron the stain through the cloth for 5-10 seconds, then remove the heat for 20-30 seconds. Repeat as necessary, buffing lightly with the cloth after every 2-3 heat cycles. A hair dryer may used instead of the iron. Set it to medium heat and hold 2-4 inches from the stain. Buff the stain with the napkin or tee shirt as you heat the wood.

Also take a look at Room and Board....they have several tables with different wood finishes or wood/steel/metal bases and a good selection of various tabletop materials. Also if you prefer a wood table, an area rug underneath the table could also help to break up all of the wood too.

If it is a casual buffet type meal you don't need to go over board on the dinner table. I would suggest a lovely table runner a pose of fresh flowers (not high so that you block peoples view across the table). Some lovely place mats, standard silverware and glasses all set out and a couple of very simple candle sticks - I also love the idea of the mini Led Fairy lights but maybe around the room (perhaps a mirror if you have one in the room). If you have napkin rings or can make lovely napkins shapes out of origami, that adds a little bit of class and perhaps a small chocolate at each place setting. Don't go over board. After all it is the company (and the food) that should be the star of the night and you need to relax as well. Not every decorative piece needs to be on the table.

Round! Just as elegant as a square table, but with so much more flow in a small room.