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Your area depends on what might be more feasible as different areas have different price points for certain models. Let's start off with don't get a 318. They are good cars, but te 4 cyl engine is very underpowered and soon you will want to make it go faster and your options are severely limited.
The E30's are gorgeous and have a very nice design. They are lightweight and have excellent handling. They are around 25 years old now but parts are still available. Available in both coupe and sedan. I would get an E30 as an Autocross car.
E36's are more common and easier to find in writer shape as their newer. They were OBD1 from 1992-1995. A lot of people prefer the OBD1 models as they can be easier to mod and cheaper when certain things fail. An example is the OBD1 versions have 2 O2 sensors where as the OBD2 cars have 4. These would more likely be in your price range as opposed to the 1996-1998 E36's. In 1996 they changed from 325 to 323 and 328. They switched the engine displacement due to the OBD2 versions making less power. The 328 is the preferred engine if you can afford it.
Any other questions feel free to ask!
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