First NAS/HTPC any tips?

[namestorm]

Im looking at building a nas/htpc but my main issue is that i cant seem to pick a cpu because im not sure what to look for, i was leaning towards just a celeron g1840 because i dont plan on doing any transcoding, just transfering files between computers and using this pc really as mass storage, all content thatll be watched will be on a laptop or another computer so i dont think i need a strong processor because no transcoding is needed, i just want to be able to share movies from one place instead of having a bunch of external hard drives everywhere, would this cpu fit my needs?

[linuxfan66]

Run a light os to serve the files.

[Eniqmatic]

Which OS? Other hardware?

[techguru]

Im looking at building a nas/htpc but my main issue is that i cant seem to pick a cpu because im not sure what to look for, i was leaning towards just a celeron g1840 because i dont plan on doing any transcoding, just transfering files between computers and using this pc really as mass storage, all content thatll be watched will be on a laptop or another computer so i dont think i need a strong processor because no transcoding is needed, i just want to be able to share movies from one place instead of having a bunch of external hard drives everywhere, would this cpu fit my needs?

budget for this pc?

country?