main dish suggestions

Let's think healthy here. I would do something like salmon, preferably wild. So easy to prepare - practically effortless if you have the right equipment - like a great stainless steel fish poacher. Salmon - if done the right way - infused with bay leaves and lemon juice and black peppers while being poached - is elegant and delicious. It can be made a day ahead and refrigerated, served chilled or it can be done an hour before the guests arrive and served tantalizingly hot. Either way - it is delightful. You can try my "sans souci" salmon.

Maybe some grilled steak with some kind of fresh chopped tomato salsa on top?

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was also thinking of something along the lines of shrimp and grits. or a whole sea bass, stuffed with fresh herbs and grilled or baked in a salt crust with a fresh tomato salad/salsa on the side.

I really like shrimp with polenta, here is one I've made: http://www.wholefoodsmarket.com/recipe/saut%C3%A9ed-shrimp-polenta-and-manchego-sauce that was a success. If you want meat, grilled flank or hangar steak is nice, such as this one: http://www.kitchenmonki.com/recipe/Marinated_Grilled_Hanger_Steak_With_Soft_Corn_Polenta. You could add some greens to complete the dish.