Orzo serves a different function to rice in Italian cuisine, though I do make a devastatingly tasty "orzotto" with bacon, peas and Parmesan. I don't think that rice-avoiders, on the grounds of carbohydrate content, would gain much succour from orzo...

I'm not a fan of fusilli. Get thee to a Waitrose and buy a bag of bucatini spirali (it's a pasta from Gragnano). I think it's far superior to fusilli and can be used instead of it every time.