For P1 old school ones i would go 1.2k max on budget, and say 800 more on descent set of tires. Around the 2k mark. I personally advise anyone who is after to mod a gd3 not to do it. Parts are so rare here in sydney. I been trying to source VTis/Modulo parts and my god what a headache. 2 Months only have the back Face lifted.