there is a limited option of suspension and engine components so please specify what you are trying to achieve. most folks here keep the engine stock for the most part, with a simple intake mod. search jbrady intake. there is an exhaust thread as well expounding on the subject further. as for suspension it all depends on your threshold of comfort. close to factory lowered, or stock height?
as for the brakes, most beneficial is to simply upgrade the pads alone. the factory brakes are sufficient, unless you plan to do track time where you will need to worry about brake fade and extreme temps (not likely).