If you are not Japanese savvy and mostly want US games, I would say either spring for a US Boxed Duo as was mentioned since you will not have to hunt for a system card 3....then you have access to every US HuCard, and ANY CD-ROM2 or Super CD Rom game....
if you aren't sure you will like the Turbo that much (who are we kidding here, you will love it, :-D), just buy a standard Turbo Grafx-16 and a few HuCard games just to get started. You can then do the following at a later date:
[ul][li]Find the CD Addon + US System card 3 and be able to play all the US games and any CD/SCD game[/li][li]Find CD addon + get a converter or region mod + Cheaper Japanese System Card 3 and have access to every HuCard (US and Japanese) plus any CD/SCD games....[/li][li]Sell the unit and get that Duo-R! <<< Probably the best option[/li][/ul]
the Japanese System Card 3 is way cheaper, and if you have a converter, works the same in a US Turbo Grafx, thus saving you money if you region mod your Turbo....and lets you do everything.
Some users here perform region mods if I'm not mistaken, and they don't cost too much!
But as was mentioned and is probably obvious by now, a Duo-R is ultimately the best system to obtain, though it is a lot to spend at the start if you're unsure.
Some HuCard games from US that you should try out:
Bonks Adventure, Blazing Lazers, R-Type, Silent Debuggers, and Legendary Axe
I'm sure others can recommend more
anyway, welcome!