Been a while since any input on this list, but I'll reply as I had the same idea starting out - wanting to get both ends of the spectrum.

At the moment I would say Hawaiian Snow (sativa - Green House) and AK-47 (indica - Serious). The AK is the frostiest thing I've ever seen - shows preflowers like crazy in veg - you'd think it's started flowering! And the Hawaiian Snow has the prettiest most rock hard buds, and if you can wait the 12 weeks will reward you with the most intense high you can imagine.