partitioning - What is the recommended disk partition for kubuntu 14.04 manual install and dual boot with Windows 8.1 64 bit?

My computer has 6GB RAM and Windows 8.1 64 bit.
I try to install kubuntu 14.04 64 bit by manual disk partition.
My current disk has 283GB Free Space.
(parted) print free
Model: ATA WDC WD10EZEX-22B (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start   End     Size    File system  Name                          Flags
        17.4kB  1049kB  1031kB  Free Space
 1      1049kB  840MB   839MB   ntfs         Basic data partition          hidden, diag
 2      840MB   1113MB  273MB   fat32        EFI system partition          boot
 3      1113MB  1247MB  134MB                Microsoft reserved partition  msftres
 4      1247MB  162GB   161GB   ntfs         Basic data partition          msftdata
 5      162GB   700GB   538GB   ntfs         Basic data partition          msftdata
        700GB   983GB   283GB   Free Space
 6      983GB   1000GB  16.9GB  ntfs         Basic data partition          hidden, diag
        1000GB  1000GB  729kB   Free Space