My favorite is Nevada, as well. Sierra is a red version of Nevada and is great also, though seeds are a bit harder to find. I also grow romaine and Summertime. I like lettuces with a bit of texture, since so many leaf lettuces go limp when you put a bit of dressing on them, but I'm always trying new leaf lettuces as well. To grow good sweet lettuce, it needs to grow fast, so it needs lot of water and good fertility. Plan on watering it more than anything else in your garden.
Nevada:
Sierra (young crowded plants) :
Young Summertime plants :
I start my lettuce early in flats and plant out early. It takes transplanting amazingly well, it will go limp for a day or two and look terrible, but will pop back up soon. I hardly ever lose a seedling, despite a lot of root disturbance.