Cheapest I've seen the G19 at the current price, also there is a sale for the Logitech Z-5500 going for $335.
G19 features:
Tiltable, color GamePanel™ LCD
The (320x240) display shows you what you need to know—in- and out-of-game—including game stats, system info, VOIP communication data, video playback, image slideshows, and more.You get more intel with GamePanel. Find out why it matters.
Custom-color backlighting
You can personalize the character backlighting to better fit with the rest of your computer and gaming equipment, and easily locate keys—even in the dark.
12 fully-programmable G-keys
Three macros per key let you configure up to 36 unique functions per game, including single keypresses or complex macros. You can also create macros on the fly.*
Two high-speed USB 2.0 ports
The powered USB ports let you transfer data to and from peripherals—like MP3 players and flash drives—while also charging battery-powered devices.
Multi-key input
You can use up to five keys at once to perform multiple complex actions.
Game/desktop mode
No accidental interruptions—you can disable the Windows/Context Menu keys when you play.
Intelligent cable management
You can keep mouse, headset, and other cords out of the way by routing them through channels on the underside of the keyboard.
Instant media access
Convenient one-touch controls give you instant access to volume control and media playback.
Public software development kit (SDK)
You can upload the latest enhancements developed exclusively for GamePanel™ by the Logitech open-source community.
Onboard memory
It saves your profiles so you can take your personal preferences with you.
I guess it's worth it if you don't mind dealing with Eddy and his smoke-filled shop.