Well happy day to me! NewEgg had a 500GB 7200.4 SATA drive on sale for $49.99. http://www.newegg.com/Product/Produc...m-_-22-148-374
Coupon code: EMCYTZT726

Now I'll have far more than enough space to add as many distros as I please. I can try them all in both 32 and 64 bit versions on their own partitions.

sda1 (ext4) Fedora 15 64-bit
sda2 (ext4) Fedora 15 32-bit
sda3 (ext4) Ubuntu 10.04.3 64-bit
sda4 (ext4) Ubuntu 10.04.3 32-bit
sda5 (ext4) Debian 6.0.2 64-bit
sda6 (ext4) Debian 6.0.2 32-bit
sda7 (ext4) Opensuse 11.4 64-bit
sda8 (ext4) Opensuse 11.4 32-bit
sda9 (ntfs or ext4) User Storage.

I just need to do a full read of the Debian, Ubuntu and Fedora install guides (wiki's) to see if there are any known issues with an NTFS partition on a boot drive and how I go about partitioning and formating a brand new, unused drive.