Lenovo G580 vs Acer Aspire 5749

Hi, looking for a bit of advice from those more in the know than myself. Ive a Dell at the mo which has lasted me for a good 5 years and im thinking its time for an upgrade. I use my laptop for a fair bit of office work (word, excel and powerpoint) and general internet use (downloading music, watching movies etc). Ive a budget of €400 - 500 but would really rather keep it to the low 400s. I've whittled it down to the following two so far:
http://www.dabs.ie/products/acer-aspire-5749-core-i3-2350-4gb-500gb-dvd-rw-15-6--w7hp-7X4C.html?src=2
and
http://www.saveonlaptops.co.uk/Lenovo_G580_1234979.html

Both are coming in at around the same price but I'm kinda leaning towards to the lenovo only cos it has usb3 ports.
Any advice on which is the better laptop???? Or suggestions for a better one which is similarly priced!
Cheers