I agree the brown chairs are too much brown. Of the chairs you show, I like either the orange or blue (based on whatever your color scheme is) and the slight tufting adds some interest. The sea-green chair has too much tufting going on for such a simple table. Actually, the maroon chairs aren't bad, but, doesn't give much contrast to the brown table, IMO, but would work fine. If they are RED, then that's a better contrast.

Have you checked the inside leg dimension on the table to ensure any of the optional chairs will fit with enough comfort space (elbow room) for the sitters if you are putting 2 chairs per side? This may help with your decision.

Thanks!!, I was leaning towards the orange too, I was thinking of a warmer color dining room. I havent checked the inside leg dimension on the table, will definitely check that out, i didnt think about elbow room. I was thinking from the point of view of legs, whether there would be enough space under the table, without peoples legs being hit, if I put two chairs on each side :).