Upgrade or wait?

Asus P5B Deluxe
E6600 @ 3.3GH (OC)
Tuniq T-120
eVGA 8800GTS 640 mb
G.Skill 2GB DDR2800
WD Raptor 150GB
SB Audigy
OCZ GameXtream 600w
Antec 900
OS: XP Pro

This system is about 2.5 years old. My question is, would I be better off spending ~$500-$750 now for some upgrades or should I wait until then new GPU's come out in 2010 and build a new system (for $2.5k or so)?

I hate how noisy the Raptor is (I hear it above all else) and need more HDD space, so I would probably add a couple WD black 500GB in Raid 0.

If I were to upgrade CPU and/or GPU now, what should I look for that is compatible with this board and would be a noticeable step up?

One issue is I have went through two sets of G. Skill memory, both times each stick was fried. Me and everyone I have had look at it have no clue what the issue is, I suspect the power supply with voltage spikes or something.