Forget about the "slim design" for your budget

You don't need discrete GPU for your usage, Intel HD will do fine. As for MS Office, as long as it does not involve heavy Excel (lots and lots of formula / VBA) or Access database, Intel Celeron will do.
Acer
E1-432-29552G50k, Intel 2955U + Intel HD@RM1099, 2GB, 500GB, FreeDOS
E1-470-33214G50s, i3-3217U + Intel HD4000@RM1399, 4GB, 500GB, FreeDOS
Asus
X45A-VX078, Celeron 1000M + Intel HD@RM1199, 2GB, 500GB, FreeDOS, 1 year warranty
Dell
Inspiron 14-3437, i3-4010U + Intel HD4400@RM1399[1.99kg], Ubuntu, 4GB, 750GB(5400rpm), 4-cell; W8SL@RM1549
Inspiron 14-3421, i3-3217U + Intel HD4000@RM1399[1.99kg], Win8SL, 2GB, 500GB(5400rpm), 4-cell
Inspiron 14-3421, 1007U + Intel HD@RM999[1.99kg], Linux, 2GB, 500GB(5400rpm), 4-cell; W8SL@RM1099
Lenovo
G400s, Pentium 2020 + Intel HD@RM1349, 4GB, 500GB, W8
Toshiba
Satellite C800-1022, Pentium 2020M + Intel HD4000@Rm1369, 2GB, 500GB, W8SL, 2 years local warranty
Prices are RSP, negotiable.
FreeDOS mean you need to get and install OS yourself.
enquiring bout the DELL INSPIRON 14-3421, i3-3217U + INTEL HD4000 @RM1399, WINDOWS8, 2GB RAM, 500GB model, is it touch screen model?