WalMart is reissuing the G1 Decepticon Cassettes Rumble, Frenzy, Ravage and Laserbeak in two
2 packs sometime this year as well as Soundwave so you should wait and save yourself some money.
I intend to wait as I just need Laserbeak to complete my G1 Cassettes.
You're right, for most I can wait; the only one I'd really like to have in G1 format is an original Buzzsaw. I'm old enough that I'm willing to pay a premium for him. I am pretty permissive letting my son play with my G1 toys and Buzzsaw's leg joint failed on him a few days ago.
Forgot to mention, the reissue G1 WalMart Soundwave Will come with Buzzsaw so if you buy that plus the 2 packs
he'll be complete with his first 5 minions.