Yes you can get 200bhp from the engine, standardyou can push it to 220, after that the injectors arent good enough. After 240 you need forged internals.
But you can achieve it with less than £1000 with second hand materials or £5000 with lots of goodies.
1.8, 2.0 will need things like new mounts etc, driveshafts.... costly
Have a look at what others do. A search brings alot of information...