Im in Warren myself, right around 9 mile and van dyke, so pretty familar with the area.
1) The best place I have used for my cars is right in Warren, Im drawing a blank of the actual name. Its on Mound just south of 9 mile, on the west side of Mound. Its right next to a storage place. They have always quoted me a great price, and Ive never had complants on the service.
2) Thee best pizza place around is Louis Pizza. Its located at 9 mile and Dequindre. Just North of 9 mile, on the west side of Dequindre. They have a great antipasta salad w/ their homemade dressing. And deep dish pizza with everything baked inside the middle of the pizza. My mouth is drooling thinking of it! heh
Keep an eye out on craigslist, you will be amazed what you can get on there.