Windows 7 technical review release to expire soon

Just a reminder that the Windows 7 technical review release ends in two weeks.  Time to weigh the alternatives.   I planned to re-install Windows Vista Ultimate 64 bit.   On doing so today I found that the OS takes up 30G of hard drive real estate after you apply all of the latest updates.  This is not an acceptable solution on the 37G partition of my SSD that was occupied by Windows 7 Ultimate(approximately 9G).  I installed XP Pro 64bit.  Takes a scant 9.22G of space with all the software I typically use installed and the latest updates applied.  It boots in less than 20 seconds too!