Which Payday 2 DLC is worth getting?

Ive played payday 2 for quite a while and IMO is the Gage Mod Courier the most useful one with all those attachments. I would recommend getting the DLC's bundle's on sale though, especially the gage bunlde since you can join the heists without owning the DLC. Character packs are not that useful, i hope this helps :)

With my playtime (800h+) and recent changes to the game balance and gameplay I'd say the must have DLCs are the gage ones, ofc the rest is up to you, depends of the builds you want to use and your play style (example: the clover DLC is really good for stealth because of the burglar perk deck)

So yeah... I'd just wait for the summer sales and get them all except the goat one.