You could do a lot worse than the Gateway NV55S05u for a solid RAM-hard drive combination and an all-around decent processor in a 15-inch laptop, provided you can live with poor battery life.
If the price is right, you don't need to look any further than the Samsung 830 series to upgrade your computer's internal storage to the best possible performance.
A large-screen laptop with very good performance, the Gateway NV7802u is an attractive choice for home or office.
It may not inspire, but for less than $600, the Gateway NV5807u is a great value as an all-around 15-inch laptop.
As shown: $599
Check manufacturer's site for availability