For general "well performance", the speed of the Harddrive is most important. It would be the best, if you build in a SSD. Otherwise you have to take a look on the speed of the hdd. 7.200 R/min are much faster then only 5.400. But also louder an emit more heat.
If you don't want to render or do other really CPU-intensive jobs, you wont need an i7.
For games (not high end gaming), office and Internet an i5 is absolutly enough.
Better use the £90 for invenst in a fast SSD.

Hey guys, I am looking to get a new laptop but I'm not well versed in this area. Need advice, your opinions are very much welcome. I have a limited budget but would like a laptop with a dedicated graphics card (some gaming  ) and good CPU for all round performance. I have narrowed it down to two Acer laptops:

Acer Aspire 5755G
Intel® Core™ i5-2450M Dual Core Processor
15.6" HD Screen
Windows 7 Home Premium Edition 64-bit
4GB DDR3 RAM
500GB HDD
DVD Rewriter
Dedicated GT 630M Graphics
USB3 & HDMI

http://www.saveonlaptops.co.uk/Acer_Aspire_5755G_1201803.html

Price £450 and

   
Acer Aspire 5755G
2676G50Mnks
Intel® Core™ i7-2670QM Quad Core Processor
15.6" HD Screen
Windows 7 Home Premium Edition 64-bit
6GB RAM
500GB HDD
DVD Rewriter
Dedicated GT 630M 1GB Graphics
LX.RV402.018

http://www.saveonlaptops.co.uk/Acer_Aspire_5755G_1152339.html

Price: £540.00

As you can see there is a £90 difference but I'm not entirely sure which represents better value for money. What do you think?

PS: If you have any alternatives you think is better value don't hesitate.

Thanks in advance