They also have Playmags on Overstock for less....I think my thread a few days ago is why you may be considering these. One of the posters (YouAreTheFocus) found a better deal at Overstock. There was a 10% code on Retail me not that was good for anyone, but now it looks like it is gone. Better yet there is a 12% for new customers...Here is a link to the Overstock coupon page. If you have never ordered from them it will bring down under $70.
http://www.overstock.com/Sports-Toys...131118182352:s
http://www.overstock.com/coupons
Of course after all my research and pondering back and forth I saw the Magnformers video and showed my husband so we are probably leaning that way also I showed one of my DS's both the different types and he voted for the Magformers. My kids are older and we think they may like those better, They just turned 6 and 8, for your age kids though I would go for the Magnatiles or Playmags...I still haven't ordered, such hard decisions! I think I have a harder time with toys sometimes than I do picking out a new car!