I can only suggest you create more partitions during the initial install.
10-20 gig for os's, and a data partition of sufficient size for all the crap one accumulates in pc's.
a gig swap is more than enough.
ref my advanced install article for some ideas if you wish, most os's won't go over 8 gig installing EVERything on the cd. here is a screenshot of my layout, 60 gig drive,
hda1 w2k, hda5 fat32 data,hda6 swap, hda7 slackware,hda8 dsl, hda9 yoper, hda10 suse, hda11 pclinuxos, hda12 linux data.
hope it helps!