Best option is to get a CECHC03 60GB fat PS3. In the UK go for the £84 on eBay sold by musicMagpie that’s refurbished. Comes with the cables (including a golden HDMI cable) and everything is extremely well refurbished and cleaned before being sent out.
Slip GT4 in, beforehand you should enable the fullscreen upscale in Game Settings and make a virtual memory card.
Game looks utterly beautiful with zero lag outside cutscenes<3