Atom 230 + 2GB RAM datastore for small server = 64 bit or 32 bit debian

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http://unix.stackexchange.com – would you recommend me for small debian linux with small apache, small mysql and primary datastore with SW RAID 5 just 32bit debian or rather 64bit and why? I have only 2 GB of RAM, so could that be enough. (it will be only CLI debian without Xserver, GUI and so on!) Thank you (HowTos)