I really recommend having 2gb of ram for snow leopard. It will use more ram when idle than tiger. Eg ,kernel task(your kernel) will use around 200 a 300mb of your ram. Stick a browser on top of that will dive ram total use up to 600mb. Add in 64mb more for integrated graphics etc. .
Going from tiger to 10.6 on my old computer was definitely worth it though. The computer was an old pentium 4 hackintosh, much older than your laptop. System performed better than when on tiger which is amazing considering that the computer came out in 2005.