partitioning - Resizing ext4 partition and applying it to an NTFS partition in Ubuntu 12.04.1?

I made a miscalculation on my Ubuntu install and now need more space for my Windows (NTFS) partition (sda2). The problem is that I allocated ~ 100GiB to what I thought would be a shared media storage directory; this was placed in an extended partition (sda4), comprised of ~ 7GiB in a swap file (sda5) and ~ 100GiB in an ext4 storage partition (sda6), respectively. I no longer require this partitioning and am now looking to allocate this sda6 space more judiciously.

As I understand it, I need to be able to have unallocated space in a partition next to the partition that I would like to add space to. There I have a problem, as I need to move ~55GiB from sda6 (ext4) to sda2 (NTFS). Please note that sda1 is a small NTFS Windows boot partition and sda3 is my ext4 Ubuntu install partition that does not have any unallocated space (at present), and only 22GiB unused.

Lastly, I am presently in GParted off of a USB boot and have a pending operation of shrinking /dev/sda6/ from 99.96GiB to 44.18GiB, but alas, I cannot add to sda2 as was my intention. I have backed up my system, though I would prefer not to undertake anything with a large probability of file loss or grub2 failure. May I please have any relevant recommendations? Thanks so much in advance.

ubuntu@ubuntu:~$ sudo fdisk -l
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x8d769ec6
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      409599      203776    7  HPFS/NTFS/exFAT
/dev/sda2          409600   341301247   170445824    7  HPFS/NTFS/exFAT
/dev/sda3       341301248   399894527    29296640   83  Linux
/dev/sda4       399896574   625141759   112622593    5  Extended
/dev/sda5       399896576   415518719     7811072   82  Linux swap / Solaris
/dev/sda6       415520768   625141759   104810496   83  Linux
Disk /dev/sdb: 4022 MB, 4022337024 bytes
255 heads, 63 sectors/track, 489 cylinders, total 7856127 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *          38     7839719     3919841    b  W95 FAT32