I suggest you keep the ones that have an asterisk in front of the serial number.
Joking aside I don't think there are any rare changeovers or anything. The toughest for me has been $5 C/C Beattie-Coyne in anything approaching Unc. I tried to buy one years ago on eBay and returned it because it was a pressed EF that smelled like bleach.
All the others... H/A, D/B, E/D, B/E are abundant in both signatures.
It's also been tough to find a nice $1 T/A to be honest. The really really tough one is the $2 I/B modified portrait. So frustrating as there are literally thousands of Devil's Face I/B but the modified is extremely rare in any condition.
In terms of specific serial number ranges I don't think it matters.