Just a couple of my favorite summer-time citrus-based scents. In no particular order:
Monsieur Balmain: It comes off as all-lemons, but the drydown is a bit woodsy and I get a little bit of leather/musk at the very tail end.
Armani Eau Pour Homme: Citrus in the mix, but a very bold woodsy/mossy scent. Definitely citrus at the start, but TONS of depth here.
Claiborne for Men: For me, this is like someone took 1988, bottled it up, and made it available for me to re-visit. The grapefruit in this one is not shy, and tends to even "shout" a bit, but even with what some refer to as a "dated construction" (it is predictable), it still delivers and retains its fans. Also can be had for a song just about anywhere.
Gendarme (Original): Oh, citrus and verbena...so brilliantly fresh. And DIFFERENT!!! When this one hit Marshall Field's State Street store about April of 1989, I saw it was new and had to try it. There was nothing else like it, not even Eternity for Men. From first sniff, all I ever knew this scent to signify is "Summer!" Citrusy brightness with a smooth, leathery drydown, I lean on this one in the summer. Love it!
Eau Sauvage by Christian Dior: Seeing as Chanel's Pour Monsieur (Original) is not offered for sale in the US, Eau Sauvage is my choice for a citrusy-fresh frag for a more dressed-up occasion. A true classic.
Just a couple ideas. Cheers!