Dave, you're not the only one who misses your Nammatj. I had the Nammatj 2 (the sand colored tent on the second or third page of this thread), for only a very short time. I quickly realized that staking was a pain in the butt, and traded the nammatj back in because of it.
That was a real mistake. The Nammatj 2 has a TON of room for a 2 person, bombproof tent. And as for staking, sure, it can be a pain, but there is always a way to make it work. I really wish I'd given the Nammatj more of a chance, I kind of feel like a moron for trading it in. But on the other hand, if you don't care about weight, my Tarra and Saitaris are outstanding tents, they just aren't suited for backpacking, unless the weight is well split up.
A big +1 to what Charles said about the sloping back wall of some Hillebergs. I read tons of horror stories about the Nallo and Nammatj back wall sloping and lack of room because of it. Like Charles, I actually prefered to sleep (and it worked just fine), with my head at the sloped end of the Nammatj. Even the 2 man was plenty big enough for me to do it without a problem.
Now I'm looking at a 1 or 2 man Hille to have as a summer-time solo, or solo+dog backpacking tent. I ahve a couple I'm considering, mainly because I love the Hilleberg's strength for using with a dog. Besides, these tents are like crack. hahahaha It's like a super expensive stamp collection. :P