I mostly collect Image trades too and here are some of my current faves:
Historical Exploration: Manifest Destiny (currently 2 trades out)
Pre-Apocalyptic: Sheltered (all 3 trades are out)
Sci-fi Mindf**k: Prophet (currently 4 of 5 trades out)
Detective with powers: Chew (currently 9 of 12 trades out)
Western Fantasy/Sci-fi: East of West (currently 3 trades out)
Pulp Action Adventure: Five Ghosts (currently 3 trades out)
What the hell did I just read/Awesome wackiness: God Hates Astronauts (currently 2 trades out)
There are a metric ton of other great trades out by Image right now. Keep an eye out for The Autumnlands, Drifter, Southern Cross, and Invisible Republic all coming out in the next two months and all sci-fi/fantasy settings.