Call me biased these days but I wouldn't run AOS4.1.x on anything less than a 733Mhz SAM Flex with 1 gig memory and a 9250 Radeon...
But just remember I used to be happy with that machine in the last line of my signature for quite a few years! So, been there, done that! Guess I never run it on anything less that that though!
Of course I'm using something a bit more serious in recent months! Whatever you choose good luck with that! :-)
