I am considering a Russian sample pack, but it'll be a couple of months before i make another shave related purchase - i've gone a bit overboard the last couple of weeks
Astra SP's were my first after the usual trial and error. Haven't tried some of the favorites...Sharks, Crystals, others. Guess I've got more work to do. I know that Derbys, Wilkys, Gillette Blues, Merkurs and Lords and a couple others are out.
My first bulk buy were Vikings Sword aka Israeli Personna. I bought 200 of them without knowing how they are. Turned out very good blades, sharp and smooth, so it was a good idea.
whean i first started i got atra blades it cut me like crazy but stuck with it and now am a pretty fast wet shaver
Early on I bought a box of Derby blades, then discovered they are completely incompatible with my face.
My first 100 were Voskhod in a TSD group buy (Before they became cheap/readily available at vendors), then there were 100 Feather, 100 Shark SuperChrome and finally 100 Personna Lab Blue.
It depends, I've all but made the switch to SE, had I not I would be going for Treet Black Beauties, smoothest blade I've ever used in a DE.