TigerDirect has a Lenovo IdeaPad Z580 15.6" Desktop Replacement Laptop for $549.99, $10.44 Shipping.

An Intel Core i7 laptop under $600.

Design – Optimal Use

This is a mid-level laptop with a good balance of power and portability.
It weighs 5.8 lbs and has a larger 15.6" screen, so it's probably not for "on the go" types.

However, the Lenovo IdeaPad Z580 has more than average amount of memory and a 3rd generation Intel CPU with enough power to handle pretty much all home or small office tasks like browsing, email, office applications, etc.

Gamers however should look for a purpose-built notebook with a discrete graphics chip.

Review

The reviewers on TigerDirect's website gives this laptop an average 4.8 out of 5 stars.

Key Attributes

• Rated for 5 hr battery life, you’ll probably get a little less
• LED-backlit screen helps reduce power usage
• Current generation Intel processor for good performance
• Large Storage Space
• 8GB of RAM for smooth multi-tasking
• Blu-ray player
• Plays and burns DVDs, CDs
• Windows 8 64-bit
• 1 year warranty

Lenovo Z580 Specifications

• 3rd generation Intel Core i7-3520M processor up to 2.9Ghz
• 4 GB RAM
• 500GB Hard Drive Space
• Widescreen 15.6" HD Display 1366×768
• Intel wireless display capable, HDMI
• 5 in 1 memory card reader (MMC, xD, MS Pro, SD, SD Pro)
• 2x USB 2.0 ports
• 2x USB 3.0 ports
• DVD Writer
• Bluetooth
• Wireless B/G/N
• USB 3.0 ports