If it'll hold 4GB RAM, go for it, much more performance gain over 2GB.
You can grab a SSD on promo somewhere. Being that I don't live in your region, don't know how the retailers works. But I have purchased components from Australian eBay sellers, and the price was only slightly higher, due to exchange rates, which I feel is a two way ripoff.
Being you live there, you can avoid this, DDR2 RAM is quite common & on eBay, at a lower cost than high performance DDR3 RAM.
The SSD, you need to get from a retailer.
While I don't know much about how the Australian retail channels works, I do understand that wages are higher, those who are retired/disabled draws more than most of the same in the US, property values seems to hold well, and one of the best things of all, no national debt to saddle future generations.
What's the deal with the availability of components? Seems that with as many citizens in the country, retailers would flourish, and there would be an equivalent of Newegg type retailers all over the place, or at least enough to meet demand. Especially considering the number of members on tech forums from the region, whom are high in numbers.
There is something missing from the overall picture, I know that taxes are higher, but there must be something else.
What is it?