My actual recipes are at home so I have to go off memory here.... surely won't be exact and may be missing one thing or another.... but...
For Santa Maria:
1/4 cup lemon juice
splash of orange juice
3/4 cup oil
1/4 cup white sugar
1/4 cup soy sauce
a lot of black pepper

1 Tbsp garlic powder
1 Tbsp onion powder
1 teaspoon cayenne
1 Tbsp dried oregano
1 teaspoon dry rosemary (or fresh, finely minced)
1/2 teaspoon dry sage
7 cloves garlic
blend it up and marinade
Let it marinade at least 48 hours... then smoke at around 250 for about five hours... can be easily grilled put I love the smoked version of SM Tri Tip... for grilling tri tip I do....
Chimichurri:
1 cup diced fresh Italian parsley
1/2 cup olive oil
1/2 cup red wine vinegar or red wine itself....
1/4 cup diced fresh cilantro
2 garlic cloves, chopped, diced, whatever
1 small onion diced (red or white)
3/4 teaspoon dried crushed red pepper
1/2 teaspoon ground cumin
1/2 teaspoon salt
then let it marinade for about 24 hours, make a bit more chimi sauce or reserve some of the original,... throw it steak one the grill... as you cook it baste the steak on either side with more chimichurri... best homemade steak I've had.
Honestly, there have been many times I buy the pre-marinaded stuff too... especially if I don't have time to let the meat marinade for at least a full day... usually comes out great too...
hope that helps...