I really want to love these Kabinis, but I'm not getting it if you are not a gamer. Near as I can tell they are barely an improvement over newish Baytrails like the J1800 in CPU performance but they are 25 W TDP compared to 10 W TDP. And you can get a J1800 SoC motherboard/CPU for under $60. They use so much more power that the Kabinis require a fan, unlike the passively cooled Celeron J1800. The Intel rig is cheaper, lower energy and lower noise. And I think they have enough juice to do what a HTPC needs to do play 1080p, etc. Then you have to deal with AMD's drivers, which are generally a PITA for me (using Linux) compared to Intel.
http://www.anandtech.com/show/7933/the-desktop-kabini-review-part-1-athlon-5350-am1/3
http://www.directron.com/j1800nh.html?gsear=1
I may end up getting one of these rigs anyway because I have an irrational atavistic fondness for AMD stemming from the old XP Athlon/P-IV days when they were cheaper, lower energy and faster than Intel, plus I'd like to see competition in the CPU market. What ticks me off about the Intel builds and most of the Kabini boards I've seen is that they only support 2 SATA ports, heck, I can't run an optical drive, boot SSD & a large spinning hard drive, much less a decent home server without getting a PCI-E SATA card.
EDIT:The Coolermaster case, Sempr0n 3850 Kabini CPU, & ASRock AM1B-ITX mobo combo for $100 comes with $16 shipping to me in California as well as tax, so it is really $122. But the board comes with 4 SATA ports so you could probably run a DVD-RW, a couple of conventional hard drives and cram a SSD into the case somewhere (though there are only 3 drive bays in the case).
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.1594348