My faves, in order from getting the military aricraft bug (12 years old) till now:
ALL - TIME favorite SR-71 Blackbird (flew from NY to LA in 45 mins:icon52:, LA to Paris, France in less than 5 hrs - at 3/4 throttle!!!)
B-17 Flying fortress
P-51
AC-130H Spectre (a C-130 Hercules with 20mm, 40mm and 105mm guns) http://www.strategic-air-command.com/aircraft/attack/ac130_spectre.htm and http://www.defenseindustrydaily.com/images/AIR_AC-130H_Specter_Firing_lg.jpg
F-15 (either streak or strike eagle) http://www.answers.com/topic/f-15-vertical-deploy-jpg
F/A 18
Mig 25 Foxbat - so ugly yet so powerful. http://images.google.com/imgres?imgurl=http://www.aviationexplorer.com/Assorted_Aircraft_Pictures/images/mig_25_foxbat_jpg.jpg&imgrefurl=http://www.aviationexplorer.com/assorted_aircraft_photos.htm&h=989&w=2685&sz=998&hl=en&start=11&um=1&tbnid=9D1DItR1GXl5EM:&tbnh=55&tbnw=150&prev=/images%3Fq%3Dmig%2B25%2Bfoxbat%26svnum%3D10%26um%3D1%26hl%3Den
F-22A Raptor
Sorry about the long links, for some reason my permissions won't let me make attachments, DAMMIT.