Since there isn't an "Editor's Choice" for an mATX desktop, what would be a good choice?
There is one SilverStone Temjin TJ08-E: MicroATX Evolved
, in my personal experience i find the frontal fan too noisy even at low settings, i had to undervolt it to 600rpm where its acceptable, but there is a newer similar version just with 2x120mm fan on the front, so it should give you much more options to chose if you decided to get better fans, Silverstone PS-07
Depending on your needs and if you appreciate smaller, you can go into Mini ITX factor, you can still build a fairly power PC with the options available today, Cases like LIAN LI PC-Q11B
that should allos you to have a fully sized ATX PSU a mini itx mobo, a dedicated GPU (limited to 260mm if i recall correctly), and so on. Check New Lian Li PC- Q11 itx case : Specification & Feature
for builds and ideas.
If you like something really small, dont need a quad or optical drive or dedicated GPU, you could build on really small enclosure, like for example,
CASE/MOBO/PSU: M350-INTEL-DH61AG-19V-160W KIT
CPU: Intel Core I3-2120T
(low profile cooler to allow the mechanical hdd bracket)
MEMORY: CORSAIR 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3 1333 Laptop Memory Model CMSO8GX3M2A1333C9
SSD OS/APP: Intel 310 80GB
(samsung has faster 128gb msata ssd but seems only available as OEM)
HDD STORAGE: Western Digital 1 TB Scorpio Blue SATA II 5400 RPM