Stay away from Kabini as it uses AMD's Jaguar architecture, it is a slow heap of molasses, don't expect to do any gaming or anything demanding for that matter, I would rather a Core 2 Duo over it.
Plus Puma (Beema and Mullins) is just around the corner, which is Jaguar's replacement.
You need to keep your expectations of AMD's CPU's on the low side, Jaguar/Kabini is an evolutionary replacement for Brazos which are the E-350 and E-450 CPU's that were found in Netbooks, so don't expect performance radically any different from that.
I actually use a Phenom 2 x6 1090T for my HTPC and use a Scythe shuriken Low profile cooler for it.
With the Phenom 2 x6 underclocked I can get some impressively low power consumption on idle and still have the performance when I need it. (For encoding and light gaming.)
I also have a Phenom 2 x6 1045T that I picked up from a swap meet for next to nothing which I intend to try my hand at under-volting in the HTPC to try and lower the power consumption. (As it's a 95w CPU rather than 125w.)
If I was in your position though I would rather opt for a Core i3 4130T (Low power), ITX 1150 Board, Bitfenix Prodigy ITX case, And use a Noctua NH-L12 to keep the CPU quiet or a Corsair H80i equipped with a couple of Noctua fans.
Then grab a passively cooled Radeon 7750.
--::{PC Gaming Master Race}::--
