My saxo Cup

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Hi guys, i'm new here so this is kinda introduction...
i'm portuguese and i'm living in london for 4 months, i have a saxo cup 16v (we call it cup in portugal but actually is a vts) i left it in portugal but now that i just go there for some weekends and some holidays i want to make it a track day car...so i want to ask you guys wheres the best place to buy a C2 vts head, cat cams 734 (new or not) a good clutch (asking advise) 4 toyo r888 15' and most of all, a stand alone ECU like the hondas Hondata K-pro.
i remap hondas for 3 years and never did nothing in my little saxo (apart prom intake and exhaust), now its time to push it a little!
i hope you guys can help me