Have you seen the Newron off-ice Skates yet?
They are incredible and replicate the same stride as an ice skate. Hard to believe I know. Every kid I have seen skating with them is shocked on how well they replicate an ice skate.
They come as a full boot ($389) or you can just get the frames ($180) and have your proshop fit them to your old skates.
You can find them on www.inlinewarehouse.com