have you tried plugging the above info into a recipe creator/calculator? i like
www.hopville.com but there are many others out there. they are useful for estimating what your OG will be, which in turn tells you how heavy a beer you are brewing. depending how heavy your recipe is, the taste of oranges night not shine through very much. most fruit beers tend to be on the lighter side so the malt and other flavors don't overpower the fruit.
i suspect that you're running heavy on hops. you might not be able to taste much orange through all that cascade

i would consider dropping either the 15 or the 10 min addition. again, a recipe calculator would help here with the IBUs.
i would definitely read up on fruit additions. i don't have my "complete joy of homebrewing" with me at the moment, but i seem to remember papazian writing something to the effect that you don't want to fully boil fruit since that does something undesirable to the pectins. not sure if you were already aware of that.