Price is not a function of design. It depends on the finish n material. You should specify what your budget for a stone top dining table set is.

you should take place your dinning table near to the all by which u can get a lot of space to decorate these place much more beautifully.

have your dining near the kitchen as it's better for accessibility. TV should not be opposite any window to avoid glare. keep the tv in the center and living room around it. Do not divide the space with a divider since these days the trend is to have open floor plan. If you divide then the space will look small.

Hi Sathya, You can plan the dining table alignment parallel to the entrance door wall with a screen / partition next to it so that it isn't visible from the entrance. To discuss this further you can get in touch with me. Regards