You will need more than 1GB of DDR2 533 RAM...that's for sure. That thing will run like a turtle with that hardware line up. I know you said you will get more RAM when you have more money but that RAM you selected is a waste really.
Here is 2 x 1GB of Crucial DDR2 800 for $21 and free shipping
http://www.newegg.com/Product/Produc...82E16820148163
If you really cannot fit the RAM in your budget...let me know and I'll see what I can do