Entry Level NAS issue is a Murky one.
You are asking which one is the Best, while these devices are actually competing on which one is the worse.
Price is starting at about $100 and you have to add a Hard Drive.
None of them really support NTFS in full, and they are very slow (the inexpensive one are rated 100Mb/sec. but really provide a rate that is similar to old 10M/sec. Network card.
To get a more decent unit you have to escalate the price to few hundred $$$.
On the other hand if you have, or can get, or build yourself, an humble computer that is about the level of P-III-1GHz, and add to it Windows Home server OS.
http://www.newegg.com/Product/...x?Item=N82E16832116395
You might spend about the same and get a better NAS with many features that are Not in existence in any of the Entry Level stand alone NAS'.
So Best? No best, just few variables that would help you to think and hopefully reach to a conclusion that suits you.
*************************
Windows Home Server can do a lot more than simple NAS.
If you have few Drives, (any kind any size can be mixed) it automatically make them appear as one cohesivedrive called WHS.
It can do auto mirroring and back up too.
Ready for HTTP and FTP servers with certificate for SSL connection (the certificate is provided with the trial version).
Provides Dynamic DNS, your_name.homeserver.com that registered when you set up the server. It is free service from Microsoft.
I.e. No need for Hamachi, Go to my PC, LogMeIn, DyDNS, or any other service that does you a favor and can shift from free to pay or partial pay when they want to.
Windows Home Server 120 days trial can be obtained from Microsoft for $5.99 shipping.
http://www.microsoft.com/windo...wshomeserver/eval.mspx