I'm pretty sure I could count the number of times I've cast Accelerate/Acceleratle on one hand. My team is naturally pretty fast anyway, so I don't have to worry about agility bonuses (and if I did, you get +100 agility from maxing out the Martial Artist track, so I'd just do that). Also, Eye for Trouble would be pretty useful if it was a passive.
I've still got a large number of regular quests to do, since I've been doing more of the extra quests. Of those, I have twenty-five remaining; of those twenty-five, six are in progress, five can't be accepted at this time, six just outright aren't available to me, and two can't be completed because I don't have DQVC access.
Dragon Quest VIII is graphically and aurally the best in the series (the latter, in terms of audio quality; your mileage may vary with regards to the compositions themselves), and is probably the least expensive (aside from the NES original) if price is a concern. There are also a bunch of spinoffs that may serve as better entry points to the series due to their relative similarity to other games you've played; of the ones that have been released here, the Dragon Quest Monsters games, which apply Dragon Quest's combat to Pokémon-style monster-battling, can be fun for a while (and Dragon Quest Monsters: Caravan Heart, a Japan-only GBA title, has been fan-translated, if you're willing to emulate), and Dragon Quest Heroes: Rocket Slime is a wonderful game that plays more like a 2D Zelda entry than a Dragon Quest game. (Also, it involves awesome giant tank robot battles.)