Having tested too many and having liked most of them (all but about 5), I've settled on a 2 way tie for the top spot. It's between two classics, Giorgio for Men and Pierre Cardin Pour Homme, with the edge going to PC. Both cheer me up like bottled sunshine.
3 sample spray colognes I purchased from Stirling Soap that are very good imo: Barbershop, Haverford, Sandpiper.