You have to ask yourself what do you like. What are you looking for in a strain, yield, flowering time, high and taste etc. Attitude, Dr. Chronic are good seed distributors that send to the US. Any of the major banks i'd concentrate on, Barneys, Dutch Passion, Serious, Sensi, Soma, Low lyfe etc. Blue berry from dutch passion is a nice strain and decent yield, high, and taste with 8week flowering time around. Thats just one choice amongst a million more strains to choose from. Ask yourself what you like, what've smoked and how many weeks youre willing to flower for. That should narrow down some choices for you...