I love DWIV. I waited so long for it, since 1990 when I saw some pics of it in Game Players and a story about the insanity of DQ there. (At the time though, we only had DWI here.... so a while yet.)
While, I personally prefer III just because I love the openendedness (for the time) of the system, and I enjoy the story wrap up...
IV is the superior game, in almost all aspects.
I levelled my chars all to level 99 back in the day. All I did was wander near the last save point in one of the towers and fight 8 King Metalslimes at once along with many metal babbles... made like... 800 000 exp a fight that way. (Chance=everyone confused=insanity!)
The day/night cycle from III, the soothing music, just the world itself seemed so... alive and vibrant. Best boss fight ever on the NES for an RPG, bar none.
If you have played DWIIIr for the GBC... there is a stronger connection than just the name to DWIV.
The back of DWVII's manual still saddens me to this day.
I have the OST for the PS DQIV remix, and it's very well done. Faithful to the material, while making it more powerful and better sounding.
Such great moments in DWIV... Aktmento (The mining town, spelling? It's been a while), The desert town with Mara and Nara. Rosa and Saro... Endor and it's awesome casino, that port town by the lighthouse where you help Taloon in the chapter V. Taloon's whole quest to begin with is something never really replicated still. (Gotta love the sword's of Malice.) The Monster Castle... ("The Skeleton monster... when it eats, where does it's food go?") heh, I loved that line.
I hope S-E puts the Zenithian half of DQ (4-6) on some sort of compilation here as compensation to the fans who have been with the series since the NES original.
DQVIII is going to be so nice... I'll make sure I have time off to play it.
This is a very... nostalgic thread.

Thanks everyone.