I was in the same situation in 2011-2012 when I was chasing old Classics releases. Unless you have a special attachment to any other less prominent TR character, aim to get the main 4 Autobots + 3 Decepticons Headmasters at retail. Even if it's not at sale prices, $25 is still way better than their scalper prices 1 year later. I'm not really trying, but still come across Hardheads and Skullcrunchers.
I'd kill for a proper Raiden.
Not talking about 6 'Quickslingers' repainted with a fair bit of talent and creativity to make the toys appear marginally dissimilar to each other. We need 6, or at least 4, new moulds for him. After it's initial release they can bury the plans & moulds along with the original designer so no further repaints/releases are possible. A large bronze statue will be cast in honor of his sacrifice.