I went for the full samples edition 5 since I decided I wanted all and got 45% off. If I wanted to save money, I'd probably look at going for full samples, but a lesser edition. I don't use most of the advanced features for strings. Edition 3 seems to have everything I want realistically.
However, I have a beastly computer (i7-5930k, 32GB RAM, lots o' SSDs) so big samples aren't an issue. If I had a more modest system, I might think about the light samples just so it didn't hit the computer so hard. Bigger samples will need more RAM, faster disk, and probably more CPU. In that case I might look at edition 3 or 4 of light samples.
You can get the full price list
here and then you just take whatever discount you get off those. If your discount is for being a repeat customer, it applies to anything. If it is the discount for the preorder, then it only applies to full samples edition 5.
I can't say for sure on full vs lite since I don't know what is changed. I can see a lot of different ways he might cut the samples down, some which would matter more to me than others.
bapu
I have to imagine that since I own all Kirk's stuff, CS3 would be mine for 50% off.
Have to add up how much you spent. I own all his stuff, but I got it all on sale so I spent about $600, which is enough for 45% but not 50%. No complaints though :D.