I think its cool to give the wizard a token melee attack, but I think this one is too good.
Lets compare it to other attacks, assuming that reflex is typically 2 points behind AC.
A wizard with an 18 intelligence and 14 wisdom would be attacking at +6 v reflex with this power. That's the equivalent of +8 v AC. If he hits, he'd do 1d8+4 damage, and push the target 2.
In comparison, a Fighter with 18 strength, a longsword, a shield, and Tide of Iron would be attacking for +7 v AC. If he hits, he'd do 1d8+4 damage, and push the target 1. He'd have the option of shifting to follow.
That leaves the wizard as more accurate than the Fighter. He can push further, but he can't follow up, but of course as a wizard he's less likely to want to follow. His damage is identical.