Olive oil, sage, rosemary, some good sausage (preferably without a casing), a little hard grating cheese, some plum tomatoes, and salt and pepper to taste. And don't forget the noodles!
Grind/chop the sausage down to small chunks, and saute them. chop up the sage, and halve the tomatoes. Warm the oil, pour it over the noodles, add the other ingredients and mix thoroughly, so the noodles and the other ingredients are just barely coated in the oil. Serve while warm. Not fancy, but it's a lot like a lot of restaurant noodle dishes, and gets you away from the traditional spaghetti with red sauce.
That said, this does require good ingredients. Don't skimp on the ingredients, you can't hide poor ingredients with a dish like this. That said, decent olive oil can be had for cheap if you use the big tin cans and one can can last a couple of months even if you're using it pretty regularly (y'know, the ones with handles and caps that come in like half-gallon sizes) and the cheese, while possibly expensive, is not used in a large quantity, as 3-6 oz is more than enough for a single meal. So if you buy a pound you still have enough for 2-4 more meals, depending on how you burn through the cheese and how many people you're feeding. (I'm from a family of 4 with a another frequent guest, and we all love our Parmesan cheese, and we still manage to get 2-4 meals out of a pound, so at 20 bucks a pound, it's still around a dollar or two per meal per person!)
It also gets you away from canned spaghetti sauce.

Don't get me wrong, canned spaghetti sauces tend to be good.. but this can be made easily, and the expensive items are pantry items. It's also fairly fast, and you can add things like mushrooms or eggplant to vary the dish. (Both are filling, and are common winter ingredients) In fact, this tends to be my standard "it's winter, I'm cold, and I want noodles" dish. Common things to add for me would be pine nuts, and sauteed garlic or onions. Pine nuts are expensive, and somewhat perishable, so if you don't use them all in that dish, plan to use them some other time that week.