Hi Mandana
What budget have you got in mind? I personally think the Dell Vostro 3460 is a good buy at the moment:
Dell Vostro 3460: Intel Core i5-3210M (2.50GHz), 14.0 inch (36cm) High Definition LED Display (1366 x 768) with anti-glare, Camera, Intel HD Graphics 4000 integrated with Ivy Bridge Processor, 6144MB (2 Dimm, 1x2048 + 1x4096) 1600MHz DDR3 Memory, 500GB Serial ATA (7200 Rpm) Hard Drive, Internal Dell Wireless 5560 built-in 3G/HSDPA, WLAN + Bluetooth, 8X DVD+/-RW, Windows 7 Pro (64 Bit), 3 Year On Site Warranty
Price: R9,549.19 Incl VAT