[R] Suggestions for RAM for new box

[Neotropical bat risk assessments]

Hi all,

My main Dell melted down a month ago and I need to buy a new workstation.
It will be Win7 64 bit and fast graphics card with large RAM.

For GIS (ArcGis) I am opting for 6 GB RAM.
Is there any advantage for R to boost this to 8 GB or will 6 GB be 
sufficient for R applications?
There have been a lot of discussion about "Big Memory" issues with R.