Dell
Inspiron 14R, i7-4500U + Nvidia GT750M (GDDR5) @RM2499[2.32kg], 8GB, 1TB(5400rpm), Ubuntu 12.04 , 6 cell; W8SL@RM2699
Inspiron 15R, i7-4500U + AMD HD8850M (GDDR5) @RM2499[2.32kg], 8GB, 1TB(5400rpm), Linux, 65WHr; W8SL@RM2699
Vostro 5470, i5-4200U + Nvidia GT740M@RM2249, 4GB, 500GB(5400rpm), W8, 3-cell
Lenovo
Z400 touch, i5-3230M + Nvidia GT740M + (1366x768, touch)@RM2199, 4GB, 1TB, W8; 2 years warranty
Z510, i5-4200M + Nvidia GT740M@RM2399[2.2kg], 4GB, 1TB, backlit, W8; 2 yrs, color: white
HP
Pavilion 14-N059TX, i5-4200U + Nvidia GT740M@RM2099[2.03kg], 4GB, 750GB, W8; colors: silver/black
ASUS
K451LB-WX071H, i5-4200U + Nvidia GT740M@RM2199, 4GB, 750GB, W8
i think a laptop that weighs around 2.3kg is okay for you. the lightest laptop recommended by me is the Dell Vostro 5470, with weight of 1.62kg. prices are RRP and negotiable.