How well will S.T.A.L.K.E.R. run on my laptop?

I've been looking at this game, and it looks pretty cool. I am wanting to buy it, but I want to hear how well it'll work on my laptop first. My laptop specs:

Dell Inspiron E1705
Windows XP Service Pack 2
256MB GeForce 7900 GS Go
Intel Integrated HD Audio Card
2GB RAM
2.16 GHz @ 994 MHz Intel Centrino Duo Core Processor

So, how smooth will it run, and what graphics settings can this be set on?

Thanks in Advance. :)

Do not turn on Dynamic Shaders at all. I have: 

ATI Radeon X1800XTX 512GDDR3

Intel Core 2 Duo E6600 2.4ghz 1033mhz FSB

4x 512mb DDR-800 memory

And my PC can't get an average fps of 60 with even without sunshadow or grass shadow with medium settings on 1280x1024.