Garmin Edge 510 GPS for $280.49, Garmin Edge 510 GPS Bundle for $339.99

Garmin Connect compatible (online community where you analyze, categorize and share data)
Virtual Partner (train against a digital person)
Courses (compete against previous activities)
Auto Pause (pauses and resumes timer based on speed)
Auto Lap (automatically starts a new lap)
Auto Scroll (cycles through data pages during workout)
Advanced workouts (create custom, goal-oriented workouts)
Time/distance alert (triggers alarm when you reach goal)
Interval training (set up exercise and rest intervals)
Heart rate-based calorie computation
Customizable screen(s)
Barometric altimeter
Power meter compatible (displays power data from compatible 3rd party ANT+-enabled power meters) (records data approx. 1 per second)
Temperature (displays and records temperature while you ride)
Shock-resistant
Operating temperature: -20°C to +55°C
Connected features via a Smartphone
GLONASS
Compatible with Garmin Connect Mobile