Well, let me lay out the Seekers you could find, and you choose the ones you can most likely afford.
These are definitely the way to go if you're into G1 Seekers:
If you're willing to fork out about $20-40 bucks per figure.
Looking for some Movie Seekers?
Although, good luck finding this guy at a nice price:
Bleh...only Starscream had an Energon Toy:
How about some Prime Seekers?
Go FE Deluxe...
Or PRiD Voyager...
With Japanese Arms Micron Exclusives:
And upcoming Thundercracker!
There are probably a few I missed, maybe some legends down-scales, but the choice is yours.
And welcome back to collecting!