I loved specially the PSP games, Rage Racer and Type 4. Sadly for me the last Ridge Racer is the Vita one, which was cool buck sadly was hurt by its DLC strategy and lack of content.
I'd love to see some sort of reboot that remakes and merges in a single game all the content (game modes, cars, music tracks, circuits...) from the entire series -ending in the Vita game- plus a few additions, focusing on the gameplay of the PSP games and upgrades the visuals to 4K 60fps visuals that keep the classic the art style of the series.