You need to be careful with Summit hops. Instead of tangerine you can get onion and garlic flavors - not sure if it is related to the specific batches/years or how much you use or when you use them. I tried them in an APA a couple of years back and had onion beer instead - the only beer I ever dumped (after giving it plenty of time in the bottles to see if it would age out). I think Summit can be good, but I would suggest making sure you like the way they smell raw, before putting them in the boil. If you don't, don't use them.
I still think you should go with the zest of some lemons and oranges - I suppose tangerine, though I've never tried that - and some citrusy American hops.