What is "ultra series"?
Do you mean ultrabook?
If you want laptop with that "ultrabook" sticker, you will have very limited choices with your budget.
If what you look for is just thin and light, then:
Asus
BU400A-W3212G, i5-3337U + Intel HD4000@RM3199[1.64kg], 4GB, 500GB, W8P
Dell
Vostro 5470, i3-4010U + Intel HD4400 + 32GB mSATA + 500GB(5400rpm) + (1366x768;touch)@RM2149, 4GB, 500GB(5400rpm), W8, 3-cell
Vostro 5470, i5-4200U + Nvidia GT740M + 32GB mSATA + 500GB(5400rpm) + (1366x768; Touch)@RM2549, 4GB, W8.1, 3-cell
HP
ProBook 430 G1, i5-4200U + Intel HD4400 + (1366x768, anti-glare)@RM2399[1.5kg], 4GB, 500GB (5400rpm), W7P/W8P, 44WHr, spill-resistant keyboard
Lenovo
U430T, i5-4200U + Nvidia GT730M + (1600x900; touch)+ 8GB SSHD + 500GB HDD@RM2799, 4GB, W8, 2 yrs
Prices are RSP, negotiable.
can be ultrabook or any notebook should be light and easy to carry around.