I've messed with a lot of different triggers and accessories for Glocks over the years and I've found that most of them aren't really worth the hassle. You're on the right track with your list. I personally think the drop in triggers are a bit of a waste when the TTI kit is great and $40, but I've messed with the pyramid and there's nothing wrong with it. If I were starting fresh with a Production Glock I would go
Sights: Dawson Adjustable
Guiderod: Jager with 13lb ISMI
Trigger: TTI Grandmaster Kit
I'm not against anybody spending money on Glocks, I'd have a Gucci Glock if they weren't so expensive, but these are the only three upgrades that have made a significant difference. *The guiderod doesn't make a difference in slow-mo video I've taken but it makes the perceived recoil so much nicer and ejection is slightly better.