Now have things clocked up a bit:
CPU from 2.80 GHz up to 3.358 GHz
RAM from DDR3 1066 up to DDR3 1600
Video up from 725 MHz / 1000 MHz up to 775 MHz / 1125 MHz
(see the CPUZ info link in my AH BBS signature)
This boosted my 3dMark06 score from about 18500 up to 21252.
Thanks again for all the feedback!
EDIT:Aces High is *beautiful* with all the eye-candy turned on! I never realized how much I was missing.