Welcome aboard! I had about the same wait time before I was approved for the forum.
Now that you have a Turbo I'd play the hell out of what you have and then start thinking about picking up a Duo R or Duo RX to play CD and SCD games. They are cheaper and typically more reliable than a US Duo (US Duo's tend to develope sound issues which can be fixed), although personally asthetically I prefer the black US Duo. Keep in mind you can play Japanese and US CD games on both Japanese and US Duos as they are not region locked like Hucards.
There aren't too many RPGs on HuCard, but if you like action RPGs you should look into Dragon's Curse, Cadash and the Neutopia series. Once you get a Duo you can get access to YS Book I & II, YS III, Cosmic Fantasy 2 and Dragon Slayer, which are all excellent RPGs translated in English. Also beware the price gouging on Ebay particularly on US Turbo games.