RE: 200 sx wont start........maybe the starter??
Hope you have fixed it by now.
If not, don't forget the battery terminals. If corroded they will not be able to allow sufficent amps to turn the starter motor. This will seam like the starter is bad but it may not be. All the electrical stuff in the car will work fine untill you turn the key to start. All the stuff will turn off like the starter is shorting out and then come back on when the key is released from the start position. Clean the battery posts and terminals first and check the terminals for brakes in the metal. Two replacement terminals are less than $10 at autopart stores.
Always start trouble shooting with the least expensive parts. To many people, garages included, want to replace all the expensive parts first. Gamble on the cheep stuff first if you are not sure. I have seen batteries replaced when it was a battery cable, alternator replaced when it was a dead cell in a battery etc.