Welcome to the club. I can almost guarentee that most of the people on here will tell you to upgrade your engine to the 1.3 if you are looking to make the car a bit faster. If however you dont feel that you are to up to that then pretty much all the things that you suggested will work a treat..I have fitted a K&N filter to my car:

Most people on here will reccomend the pannel filter instead of the induction kit if you are looking for power more than noise. All i can say really is just to have a good look around the site, you will find loads of posts of what you can/cant do!