Let's see...
The good ol' SPNKR
Halo 3's FRG
The SRS99 and its modifications
The Spartan Laser
The M12 Warthog, especially from behind
The Falcon
The Wraith
The Phantom
Marathon-Class Cruisers
Reach's Frigates
Sabres
CCS Battlecruisers
Any Covenant carrier, basically
[Edited on 05.26.2012 12:32 AM PDT]
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Heretic Banshee from Halo 2. Dat gold paint job.