Woah! 2 MB RAM? I think you mean 2 GB RAM
MB is really small.
Also, if you have a windows 7 PC, stick a memory stick in it and set it to be 'Dedicated to readyboost'. this will make your PC think that it is another stick of RAM.
In terms of modpacks you could run, I recommend Tekkit Lite, Tekkit Classic, or my modpack http://www.technicpack.net/modpack/details/andystans-tiny-tech-pack.469874