We've enjoyed such great salads lately, it's hard to beat.
My flats of salad mix, mesclun mix, pots of spinach, spinach in the ground, Tennis Ball lettuce in the ground, sown mesclun and arugula in various garden plots, and perennial French sorrel are providing totally delicious mixtures of lettuce, mustards, arugula, other greens, and spinach for our dinner salads (and my lunch salad greens on sandwiches, too).
There are a lot of good 'salad mixes' out there -- all of our reputable seed companies provide their different custom mixes from spicy Asian to mild Salad mix. And some of them are even available in our big box stores (at least this season)!