I've been using Vegas Movie Stidio Platinum v6 off and on for quite a while now but sadly the PC died

, mobo and PSU, so I've invested in a shiny new PC VISTA X64 (quad core 4Gb memory and GT 120 graphics card)

, so vegas needs upgrading, but I am unsure of which version

.
Looking on the sonycreativesoftware site
Sony Creative Software - Vegas Movie Studio 9 Platinum Edition - Vegas Family Comparison, and comparing Platinum and PLatinum Pro the only difference seems to be PRo inclides Soundforge 9, SOund Effects and 3d Blue Transistions (whatever that is).
Are there any onther more subtle differences or is the difference only in the inclusion of the products mentioned?
ALso what are 3D Blue transitions
Oh Currently only editing DV
TIA
MG