What would give my system in my sig the most signaficant performance boost ? Upgrading to a NF2 mobo, upgrading from my xp1700 to a Barton 2500, or purchasing another 512mb of the same ram Im currently using (for a total of 768mb) ? Concider that my main uses for this rig are movie conversions, DL'ing, gaming, and general surfing in pretty much that order. Ive been going over which to do for a few weeks now and just cant decide which is best. Thk for your opinions.