Absolute best whaling event and how many units needed

The last event that genuinely advanced my account was Heart of Fire (credit all the free stuff), due to the solid R3 and R2 packages.
I have about 5500 units stored, and I would like to know if we will ever get an event as good as HOF where you don't need to spend over 10k units to get something remotely worth it.
If so, what is the event? And if Heart of Fire was just a rare gift from Kabam, how many units should I realistically save up for the next best sale? I'm currently looking at 4th of July, but I've never participated in one of those sales.
While you guys are here, who should I rank 3: Shuri, OG Storm, Venompool, Prowler, Silk, Professor X, Gladiator. All are unduped. Currently planning on taking Silk up, but Storm and Shuri seem pretty solid.
I have about 5500 units stored, and I would like to know if we will ever get an event as good as HOF where you don't need to spend over 10k units to get something remotely worth it.
If so, what is the event? And if Heart of Fire was just a rare gift from Kabam, how many units should I realistically save up for the next best sale? I'm currently looking at 4th of July, but I've never participated in one of those sales.
While you guys are here, who should I rank 3: Shuri, OG Storm, Venompool, Prowler, Silk, Professor X, Gladiator. All are unduped. Currently planning on taking Silk up, but Storm and Shuri seem pretty solid.
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Comments
Cyber weekend is likely to give you the most for your units, but you can always look at J4 and see if there's anything you like.