What's your favourite primer?

What's YOUR favourite primer for face? Last spring I was out looking for an appropriate primer for me, but I just couldn't decide which one to buy, so I'll buy a primer this following autumn instead. I've been thinking of buying the Lancôme ''La Base Pro'' now for quite a long time, but I'm not sure if it's that good(??). Please every suggestion of your best primer is helpful! It doesn't matter if it's drugstore-cheep or ridiculously expensive. Thank you guys :)

Update: I bought the ''Smashbox Photo Finish Light''.