Count my vote regarding Might&Magic. It fits your description almost by the letter (turn based combat, first person perspective) if you stick to parts III, IV and V. Don't know about the newer ones, I cut back on playing after the World of Xeen. That is M&M IV + V: if you install both, named "Clouds of Xeen" and "Darkside of Xeen", they make up the "World of Xeen", and you get a _really_ big world to explore. They also come with a mix of Fantasy and SciFi that I liked very much.

BTW, Wizardry VII was named "Crusaders of the Dark Savant". Just finished mapping the whole world (by pasting automap-puzzle-pieces) a couple months ago.

Another thing not mentioned here (why?) is Lands of Lore 1 (never played 2 myself) and Dungeon Master (1 or 2, 2 is pretty short IMHO). All of them call up pleasant memories of first person play. I guess you already know the old "Eye of the Beholder"-series?

If you can deal with playing realtime, I would not hesitate a second and start playing Ultima Underworld. Yes, it is pretty old, the graphics are from a time when 320x200 VGA caused "Ooooh"s and "Aaaah"s, but, hey, the same is true for Wizardry VII, M&M IV/V, Lands of Lore, and they all still are great games IMO that I would not hesitate to play again if:
a) I had the necessary time to spare and
b) I did not remember them so well (a bad memory has its advantages, too )

Ultima Underworld 1 and 2 were revolutionary games at their time, giving you free movement and first person perspective for a RPG when most others kept you jumping from square to square. Plus, the world of UU has a very dense atmosphere that can catch you and make you shrink back in you chair at the sound of a creaking gate somewhere in the darkness ahead. And the dungeons make sense, with different areas for different peoples, they seem real and inhabited - opposed to the random dungeons of Daggerfall. Daggerfall gives you an amazing freedom in character development and individuality, with itemmakers, spellmakers, lots of clothes, guilds, vampirism, lycanthropy, ..., but the dungeons begin to test you patience after some time. And playing Daggerfall, you easily spend a _lot_ of time.

If you like it Science Fiction as well as fantasy, you really should try System Shock 1 (maybe 2) as well. Developed by almost the same people as Ultima Underworld, it also gives you the first person perspective, free movement and realtime combat, along with a similarly dense atmosphere, which can make the hairs at the back of your neck stand when you open a bulkhead aboard the space station only to hear the whirr of a security bots servos up ahead. You leap aside, hoping to gain the little cover the doorway can grant you and ready your magnum. You check the ammo a last time - good, slugs, appropriate for this new foe - and open fire just as he rounds the corner. Four shots, and he is down, sparks flying. You sneak up to his remains, seeking to salvage whatever ammunition is left in this tin can, then you notice the reason for this encounter: a security camera, in the upper right corner of this passage. You whip out your lead pipe, bonk... "Level security is now at 73%"...
Sorry, got carried away.

My suggestion: go for it, a lot of great titles have been recommended here. Plus, most of them are older, so you can probably get them as a "classic edition" pretty cheap.
If you need further info on any of the games, or maybe help with some tricky puzzle, just ask. It seems like there are lots of experienced players around (is it arrogant to count me in, considering my age is still far from 30?), and walkthroughs for most of these games should also be available.

Have lots of fun,
LabRat