What information should I look for?

Good Day,
I have pieced together the following system;

Emachine's T6524 AMD Athlon 64 +3500 2.19 GHz Venice S939 , 2200 MHz (11 x 200) Maximum Power 67.0 W /A WDC 200GB HDD/ Dual Layer DVD±RW/ Integrated ATI Radeon Xpress 200 / Flash Media Reader / Windows XP Media Center 2005/



I have added the following upgrades

250GB Hitachi HDD a total of 450GB
An extra gig of DDR Ram Total 2.GB of DDR Ram PC 3200
Nividia Ge-force 7600 GS 512MB
I replaced the stock CPU cooler with an NT04 by Silverstone
I replaced the exhaust Fan with an 120mm LED 3 speed TRICOOL
Creative Sound Blaster Audigy 2 (Sound Card)
I've replaced the 300watt PS with a 400watt PS
VIPER 2 Case by XG (see case @XGBOX.COM) I have the Black color case

MOBO Info;

Motherboard ID 07/21/2005-RS480-SB400-6A666M4DC-00
Motherboard Name MSI RS482M2/RX482M2 (MS-7093)
Bus Type AMD Hammer
Real Clock 200 MHz
Effective Clock 200 MHz
HyperTransport Clock 1000 MHz
Memory Bus Properties
Bus Type Dual DDR SDRAM
Bus Width 128-bit
Real Clock 199 MHz (DDR)
Effective Clock 398 MHz
Bandwidth 6366 MB/s

Motherboard Physical Info

CPU Sockets/Slots 1 Socket 939
Expansion Slots 3 PCI, 1 PCI-E x16
RAM Slots 4 DDR DIMM
Integrated Devices Audio, Video, LAN, IEEE-1394
Form Factor Micro ATX
Motherboard Size 240 mm x 240 mm
Motherboard Chipset RS482/RX482
Motherboard Manufacturer
Company Name Micro-Star International

Does this system have room to overclock and what scan program do you use to gather current readings of your system. Sorry I'm a noob and want to understand the process on how to safely overclock.
Thanks...Movin