A G35 chipset is able to take advantage of an excellent drive, and a good SSD will make a huge difference.
Be aware that many bad SSD exist, especially older models.
Stick to SSD with well-known controllers: Indilinx, Samsung, Intel. Not JMicron!
A used 30GB Vertex sold for 70€ recently on eBay.de; prices are similar on eBay.com, with two being sold for 90€ last week.