I started with honey and rice syrup combos first and have only recently done brews with sorghum. My take is that sorghum is fine for a strong, hoppy IPA but has a weirdish flavor that I'm not sure I'd like in a more lightly hopped beer.
Just rice syrup will give you a very lightly colored ale that in my experience is also dry with little body and almost no head. I find rice syrup + buckwheat honey to be a great combo - the buckwheat honey will add some color, body, and head.
The rice syrup I buy is Lundberg's organic brown rice syrup though, not the high gravity brew stuff, which I haven't tried. Lundberg's is pricey but has made the base for some yummy brews for me.