Thanks for your input!
We've done a single hopped american IPA with Nelson Sauvin before (albeit with barley) that turned out great, so I know I like the hop. I might up it a bit if I decide to aim for an IPA this time as well, upping the syrup a bit too. Actually, I've not decided on the hops yet, but I think I'll work that bit out as it comes along, from previous experiences. My main concern at this point is the extract bit, where I'm a complete newbie.
Oh, and I've not managed to find any buckwheat honey here... We've got some dark belgian candi syrup, though. Not that I'm looking to get this one all sugar laden, but I guess a slight touch of it might give it another dimension?