I recently got the Asus X53E (seems to be exactly the same as the K53E apart from the colour) for a budget laptop I'd definitely recommend it.
Good Points:
- Cheap for the spec (I paid £400 for an i5-2410m, 4GB RAM, 500gb hdd, 2 yr warranty)
- Even after hours (5+) of intensive use, on my lap, the laptop isn't hot at all (the palm rest remains cold, the base is barely warm)
- You get 5 hours battery life with wifi + max brightness + max performance, can get 8 hours on battery saving mode.
- Doing most tasks it is reasonably quiet.
Avg Points:
- The screen colours aren't very accurate
- The keyboard has a slight flex
Overall the build quality is better than any Acer I've owned.