Check these out! These are for you.
Dell Inspiron 14 3443-50452G-W8 14" Laptop/ Notebook (i7-5500U, 500GB, 4GB, NV 840M, W8.1)
Dell Vostro 14 5480-20452G-W8 Laptop/ Notebook (i5-5200U, 500GB, 4GB, NV GT830M, W8.1)
Lenovo G50-80 80E502-6DMJ 15.6" Laptop/ Notebook (i7-5500U, 1TB, 4GB, AMD R5 M330, W8.1)
Assuming your gf prefers a lighter one. Perhaps, these will be good for a girl.
Asus ZENBOOK UX305FA-FC197H 13.3" Laptop/ Notebook (M-5Y10, 4GB, 128GB SSD, Integrated, W8.1)
Lenovo U41-70 80JV0047MJ 14" Laptop/ Notebook (i5-5200U, 256GB SSD, 4GB, NV GT920M, W8.1)
Erm, may I know why the Z50-70 is not a better choice? I hope you don't mind me asking because I don't really know laptops
I believe the Z50-70 is cheaper on paper than the dell inspiron 3443 and vostro 5480, with larger hdd capacity, larger screen, better gpu than the 830M and M330 i think, but then the i7 5500U is better than the i7 5410U