In case you haven't been told, its tricky and time consuming to kit an a3. At least it was for me being in your same shoes. After 4 months mine is finally ripping but I did drop a pretty penny on it and did the whole vm20 jcams blah blah :P
I would add to your list a bigger sprocket for some more top end,
be sure to get 2 intake gaskets for reed valves, and the bolts you need for the intake are M5 like an inch long and get them with allen heads for your sanity
OH and here's a little searching tip, add "-re:"
i.e. "A3 -re:"