partitioning a new hard disk

[roberto <roberto03@gmail.com>]

hello,
a friend gave me a laptop (sony vaio) where i want to install debian
squeeze (in dual boot);
actually the disk is partitioned as follows (output from mount
command, #'s are my comments):

# total 82.25 GB 82.25 free, extended partition, ntfs
/dev/sda2 on /media/VAIO type fuseblk
(rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)

# total 93.14 GB, 60.35 free, primary partition, ntfs
/dev/sda5 on /media/VAIO_ type fuseblk
(rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)


how would you repartitionate the disk, since i have to leave a certain
amount of space for Xp for other users ?
i thought about installing debian next to the VAIO_ partition and then
use the other partition VAIO for read and write

thank you in advance
-- 
roberto