RAM Upgrade

Hello! I'm looking to upgrade the RAM of my Fujitsu Siemens Amilo Pro V3505 so that I can smoothly run VS Studio. 2010. The full specs for the present physical memory available is as follows:

General Information :    
M1 (Bank 0 ) :    1024  MB
 Information SPD EEPROM
Manufacturer :    Samsung  Part Number :    M4 70T2953
Serial Number :    F505B031
Type :    DDR2-SDRAM PC2-43
Format :    SO-DIMM (67.6 x
Size :    1024  MB (2 ranks
Module Buffered :    No  Module Registered :    No  Module SLi Ready (EPP) :
Width :    64-bit  Error Correction Capabil
Max. Burst Length :    8  Refresh :    Reduced (.5x)7
Voltage :    SSTL 1.8v  Prefetch Buffer :    4-bit
Manufacture :    Week 8 of
Supported Frequencies :    
CAS Latency (tCL) :    3 cl
RAS to CAS (tRCD) :    3 cl
RAS Precharge (tRP) :    3
Cycle Time (tRAS) :    8 cl
Min TRC :    11 clocks @ 200 MHz, 15
 Memory Controller Information :    
Memory Controller :    System Memory
Location :    Mainboard  Error Correction Capability :    No
Number of connectors :    2  Max. Module Size :    3072 MB   

I would like to upgrade the current 1 GB RAM to 3 GB.

A shop has listed its available RAM for notebooks as follows:
1GB DDR2 667/800 Kingston
2GB DDR2 667/800 Silicon Power
4GB DDR3 10600 Crucial
4GB DDR3 1333 Patriot

So, which RAM should I buy? Do I have to make sure it's DDR2 and not DDR3? And how about the frequency?

Despite specifying 1 GB RAM on the box, there's actually 2 sticks of RAM and 1 of them was not properly fitted. So, I've got 2 GB now.

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