Is an ugrade worthwhile?

[MONTYX5]

To make a long stoy short, my comp died and I am building a new one for the wife and taking over her old one. I intend to do a fresh install of Win7 and a ssd drive for the os/apps. The computer will be used for occasional game play and regular use of softwear like Matlab, office2007, Project manager, EES, cad, ect..
My questions are:
1). Is it worth upgrading the processer to a quad core-Q6600/6700?
2). Increase ram size to ?
3). Any other suggestions for things I may be overlooking.

I figure that this system will get me by for a long time and upgading now would be the most logical with a fresh install of os.

This is the specifics of the computer I am questioning the upgrades for:
Thermaltake Armor Series VA8000BWS Full Tower Case (Modified)
Enermax Galaxy 850 power supply
Asus P5W DH Deluxe ATX MB (V-Core Volt Mod)
Intel Core 2 Duo E6600 Processor 2.4 (Lapped) (overclocked to 3.3)
Geforce 8800 GTX
Crucial Ballistix DDR 6400 2GB
1-150 GB Raptor HD (Oper sys)
2-400 GB Western Digital Caviar (1= data,1=backup)
Kingwin KF Alumn Rack (removable hd rack)
DVD-Burn Plextor PX-755SA

Water Cooled:
BK-8800 GTX Full Block
D-tek Fusion CPU Cooler
EK North Bridge Water Block
Thermochill PA120.3 Radiator (3 Yate Loon Fans)
Laing D5 MCP655 Water Pump

Monitor: 32" Sharp Aquos LCD TV

Processor
Intel 05
Intel Core 2 Duo
6600 SL958 Malay
2.46 GHZ /4m/1066/86
L639F034

35637461
A1429

Core Voltage Spec
(.85-1.3525V)

 

[engiNURD]

http://www.cpu-upgrade.com/mb-ASUS/P5W_DH_Deluxe.html

So, make sure you have the BIOS listed there for the Q9550, and head over to Microcenter for this:
http://www.microcenter.com/single_product_results.phtml?product_id=0299412

Q9550 for $170.

Also, check the FS/T forums for a 2x2GB kit of DDR2-800, and sell your 2GB ballistix kit. If you want to get a new HDD, the single platter drives are out: 500GB Samsung F3 or Seagate 7200.12. These drives will be faster than your Raptor at sequential speeds.