I'd have to say that the Mardek games are great.
http://www.fighunter.com/?page=games The creator has made 3 chapters in this series and even though I have not played the third one (gog has given me a backlog) I loved the first 2. It had a story that kept you interested and going, semi-active battle system in which precise timing can let you deal extra damage or recieve less (Not just chose action and wait until turn is over), and other nice gameplay features.
You can easily check out the first one in about 30 minutes to an hour if I remember correctly to get a feel for the game (have not played the remade(chapter 3 engine) versions). As the link says the second chapter is about 4-10 hours, 3rd 40+ hours, so you're needs for flash rpgs should be well met.
Oh, and when you've finished this game(play it),
check out this flash review of it.
http://www.newgrounds.com/portal/view/558516.