Which network/back-up external hard drive?

So I plan to hook up my WIFI router to a network hard drive via USB. I also want to use this external hard drive for back-up.

My 1st choice at the moment is the LaCie 1TB d2 Quadra Hard Disk http://www.canadacomputers.com/product_info.php?cPath=1...

However it seems quite pricey ($190CDN). If I look at the same website I find several other hard drives, sometimes with more capacity and for much cheaper!

For example

Western Digital My Book Elite 1TB ($120)
http://www.canadacomputers.com/product_info.php?cPath=1...
... or the 1.5 TB for $140

Seagate FreeAgent Desk 2TB ($170)
http://www.canadacomputers.com/product_info.php?cPath=1...

AcomData (PDHD1000UFSE-72) PureDrive 1TB ($110)
http://www.canadacomputers.com/product_info.php?cPath=1...

AcomData (PDHD2000UFSE) PureDrive 2TB ($175)
http://www.canadacomputers.com/product_info.php?cPath=1...

HP SimpleSave 2TB ($180)
http://www.canadacomputers.com/product_info.php?cPath=1...
... or the 1.5TB for $140


HELP!
I need something dependable, and I'm willing to pay a premium for known dependability.

NOTE:

I just realized that there are "network" external hard drives that accept an ethernet connection. I think that's best, no?
e.g. Western Digital's World Edition
http://www.canadacomputers.com/product_info.php?cPath=1...