I'd do it DIY and save a bundle of money as long as you don't mind a couple screw holes in your wall. I don't know anyone who's actually taken the "removable" $55 one off their wall & I'd worry how cleanly it'd actually come off. I've had issues with 3-M Command hooks not coming off if I exceed their 3lb weight limit.
I love Applied Magnets. I've ordered from them & they have great magnets that are exactly as described. AM sells neodymium magnets with countersunk holes that hold up to 12lbs each. They cost $1 per magnet, plus S&H ($13/pkg in the US).
http://www.magnet4less.com/product_i...oducts_id=1167
They have ones that hold even more weight, but you probably don't need it. For the rod, you can just go to your local hardware store & have them cut you a length of electrical conduit (galvanized pipe). I'd go with the 1/2". I've used it before as a curtain rod at that diameter. 1/2" diameter weighs 0.85lb/ft. That way you can calculate how many magnets you need. If you buy a different diameter, this site tells you how much each size weighs per foot:
http://www.chilipepperapp.com/pipe_w...dimensions.htm
Since I rent & sometimes can only have nail holes, I'd superglue these 1/8" thick disc magnets (
http://www.magnet4less.com/product_i...oducts_id=1114) to nails and hang that way. Rated to 7lbs/magnet, though the fact that it's on a nail would likely mean less.