Should i buy the HP ProBook 450 or the Lenovo IP G510?

The HP ProBooks are a pretty dependable machine being part of HP's business class machines. It comes with an Intel Core i3-3120M. Here is a review:
http://www.notebookcheck.net/...727.0.html

The Lenovo on the other hand, also a very reliable brand/line of machines, There are multiple models and it comes with either an Intel i3 or an i5. Some of them are 3rd gen i-3s, the others are 4th gen i3's and i5's. I would strongly urge one of the 4th gen CPUs. (The 4th gen CPUs have a model number that starts with 4, such as 4200 while the 3rd gen CPUs start with a 3, like 3550.

If it were my decision I would go for the i5, 4th gen Lenovo. If the HP had an i5 from the 4th gen I would go for that.

http://www.amazon.com/...00F32ZBN6/
well I recommend the Lenovo IdeaPad Y510p 59388313 15.6-Inch Laptop (Dusk Black).

Plays Like An Athlete, Works Like A Pro. If you're looking for a feature-rich laptop that's good for high-performance multimedia, extreme gaming, and other graphics, audio and processor intensive applications, look no further than the IdeaPad Y510p. It's the high-performance notebook with looks to match. Sporting a brushed metal exterior and interior, including a backlit keyboard, the IdeaPad Y510p combines an impressive design with the latest 4th Gen Intel Core processor, discrete NVIDIA graphics and premium JBL designed speakers making this a true multimedia powerhouse. And if that's not enough, you can add even more with the unique UltraBay - an interchangeable bay that can be swapped out for dual graphics capability, increased storage or an additional fan for cooling.

-Dual NVIDIA GeForce GT750M Discrete graphics (SLI) with 2GB dedicated DDR5 VRAM - supports the latest DirectX 11 games and HD video editing
-Dolby Home Theater v4, for full impact surround sound with premium JBL speakers
-Ultrabay: an interchangeable bay that can be instantly swapped out for dual graphics capability (2nd graphics card included in Ultrabay), DVD/Blu Ray drive, increased storage space or an additional fan for cooling (DVD/BluRay drives and storage options sold separately)
-Integrated 720p HD webcam and a dual digital array microphone for crystal clear webchat
-Intelligent TouchPad, optimized for Windows 8 with easy scroll, zoom and rotate functions
-HDMI out, two USB 2.0 ports, one USB 3.0 port
-Lenovo Energy Management minimizes power use and protects battery life

-Intel Core i7-4700MQ 2.4 GHz Processor (6 MB Cache)
-8 GB DDR3 RAM
-Bluetooth Version 4.0, 1 TB 5400 rpm HDD and 8 GB Solid-State Drive Memory
-Non-Touchscreen 15.6-Inch Display, Dual NVIDIA GeForce GT750M Discrete Graphics
-Windows 8, 4-hour battery life