So after doing research I found out one of the all time greatest RTK games is available in the PSN store, RTK 8.
It was released for psp in Japan awhile back and is playable with the Ps Vita if you have one. The process for getting access to the Japanese PSN however is long and a little complicated. It requires you to remove you memory card and wipe you Ps Vita, then create a new account. https://www.youtube.com/watch?v=kt9F2R-iQu4
here's the link to a tutorial.
Just letting everyone know this is an option.