Need a new stuff

[Rydawg5143]

I need a new:
-Fan and heatsink ( currently just have stock)
-Powersource ( stock)
-Vid card ( 8800 GS i think its called)
-Memory ( have 2 G's but want faster)

Don't want to spend a lot of money but want to upgrade what i have atm

Here is system info best as i can tell: ( nothing overclocked or whatnot)
Aspire T180 AMD Athlon™ 64 X2 Dual-Core
processor 4000+
NVIDIA® GeForce® 6100 and
NVIDIA® nForce® 405 MCP
integrated graphics solution
Genuine Windows Vista®
Home Basic
Up to 4 GB of DDR2
533/667/800 MHz SDRAM
(dual-channel support on
four DIMMs)
Serial ATA hard disk up to
400 GB per 3.5" drive
RAID 0 and 1 ready
NVIDIA® GeForce® 6100
and NVIDIA nForce® 405
MCP integrated graphics
solution
PCI Express® X16 graphics
card support
Up to 6 USB 2.0 ports (2 front, 4 back)
Headphone and microphone jacks
IEEE 1394 port
PS/2 keyboard and mouse ports
Ethernet (RJ-45) port
6 audio jacks
VGA port
Parallel port
Serial port

Suggestions please
As always, thanks in advance