What's the best choice for RAM upgrading?

[bankox]

hi there,
i want to upgrade memory of my mid. 2007 macbook. i guess it's a rev.c

Model Name: MacBook
Model Identifier: MacBook2,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 1 GB
Bus Speed: 667 MHz

The point is this model can support memory up to 3Gb., so i'm wondering what's the best choice of ram matching for the most efficient.

1. 2 x 1Gb.
2. 1 x 2Gb , 1 x 1Gb.
3. 2 x 2Gb.

thanks in advance

 

[GfulDedFan]

Here's a choice from OWC. I like to use their products because all of the choices are tested and guaranteed to work for Macs.