Okay to be fair, not all inlisted is only for GT5:
PS1 : 500
PS2 : neva had one, my little brother had one so i borrowed it to play i few games on it (i know, i know,shame!!

)
GT1 -gt2 -gt3 - gt4 prologue- gt4- gt5 prologue: +- 300
Steering wheel ps2 : 80
G25 : 200
TV old (CRT) : 90 (27")
LCD TV : 40Z4500 : 1300
7.1 Speakers: 550
7.1 Denon AVR: 400
PS3 fatty: 600
3 different selfmade cockpit rigs: 300
What i would spend else :
brand new wheel (if one comes out): 300-400
Motion Simulator : 5000
If motion sim is available : steelframe cockpit : 400
And of course Gt5 Special racing nut Gearhead exclusive kaz edition : 100
Don't wanna do the math, i would hurt too much