If you are playing burned games, there's no reason not to try out Ys Iⅈ the games are high-quality and lots of fun (but not perfect).
However, there's also Ys I&II Complete+ or whatever it's called on PC/Steam/GOG, which is a beefed-up revamp of the games, which might be more your cup of tea. Or rather you will end up playing them if you discover that you love Ys, and want more Ys.
Careful with the Valis games, because they are all over the place in quality. I think my favorite, of Valis I-III, is Valis I. II is maybe worth one playthrough to enjoy the lousy English. Having played the PCE-CD version and the Sharp X86000 version, while both definitely have their problems (especially getting used to Sharp's weird controls and glitches) the Sharp game was far more enjoyable and memorable. Both soundtracks are ace though.
A lot of the more expensive shooters are not as good as some of the cheaper, imo. Down Load (or Download w/e) is a fun game that's for cheap. The Soldier games are a little too easy for me, and Compile was a company that was great at graphics and music and not so great at good level design (GunHed has too many moments of you not moving while your gigantic shot kills all the enemies on screen before they have a chance to do anything). Dragon Saber is an excellent shooter that is very playable and oozing with quality.
Legendary Axe is, to my limited experience, the best action game HuCard I've played.