Arcanum is a great choise if you whant a lot to do. The only weaknesses it has got is it's graphik (wich doesn't really matter, you'll get used to it) and it's combatsystem (wich is hack n' slash to it's extreme). Apart from that, it's a perfect RPG. The carracter system is probably the best I have ever stumbled uppon. As long asw you don't mix magic and tecnology you can do whatever you whant (well... allmost, you DO have a maxlevel at 50). When you 've finnished it the first time (with a serious charracter) you can replay it with another kind of charracter (like a dumb one (the start with a retarded half-ogre is just gold <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> <img src="/ubbthreads/images/graemlins/ROFL.gif" alt="" />), or an ugly one. Or simply another kind of charracter). Of chourse (did I spell that correctly <img src="/ubbthreads/images/graemlins/think.gif" alt="" />), there is other things thats great with the game (like it's size, or the quests, or the humour <img src="/ubbthreads/images/graemlins/up.gif" alt="" /> etc) but basicly, when you know how to get your char to lvl 30 in one day, those are not the things that keeps you going.
And of chorse, afterwards you can enter the web and start reading all the stories connected to the game (like "you know that you've played too much Arcanum when" lists, wich allways is great if you've played the game. (On one list there was one point that was: you know that you've played too much Arcanum when you can create a charracter in under ten seconds. I tried and think I made 15 secs <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />))
Ubereil
PS Maybe it falls on the 2000+ or the fact that you've allready played it (I don't know that) but you could try out Fallout 1/2. Great games DS