Are you sure its worth moving to haswell for you? the difference from both i3 should be like 10%, unless you are in for the iGPU but you seem that will be using a dedicated GPU, for this you will have to change motherboard and buy a new cpu, maybe memory. Would end up cheaper just to rebuild what you have atm, and if you want to change the size into micro ATX, there are plenty of ivy bridge motherboards that should run fine your i3.
But if you think its worth the upgrade, then here are my comments and question,
The TJ08-E is a wonderful case, really nice, i used one for two years and very efficient for cooling, but the frontal fan is very loud at 12V (1200rpm), even with the low switch (900rpm) is still very noticeable, around 700rpm becomes tolerable, and 500rpm is where i used mine lately, very quiet at this speed. So if you are perusing a quiet setup, be ready to have to undervolt the frontal fan a lot, either by external fan controller or chose a motherboard like Asus for FanXpert2, the following is the graph of the AP181 (frontal fan of the TJ08-e) on an Asus Maximus IV Gene running FanXpert2, i believe the ASUS H87M-PLUS
has also fanXpert2 for cheaper alternative on micro atx.
Another alternative, if you like the size of the TJ08-E, is the Silverstone PS-07
, which its internals are exactly the same (i also did a build for friend on it), the main changes are the front is plastic and has a door and instead of 180mm fan there are two 120mm fans, this will widen a lot of choices of motherboards and fans, for example you could go with MSI or AsRock with better PWM fan control and get 120mm PWM fans.
You mention a passive cool gpu, do you have one in mind? this is important also not only for the heatsink but for chosing the PSU.
There are option in micro ATX that dont have the first PCIe on the first slot, but on the second, ill leave you a couple of examples that could allow you to use a bigger cpu heatsink and still use a passivly cooled GPU that extends some to the back (this you will have to crosscheck once you decide the other components).Intel BOXDB85FL LGA 1150 Intel B85 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel MotherboardIntel BOXDH87RL LGA 1150 Intel H87 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard
Also, is there much of a difference in the power draw between mATX Haswell MBs (assuming that I'm not buying an all-the-bells-and whistles OCing board)?
The most efficient motherboards in my experience have been intel, but the difference isnt as much as to jump to a bigger PSU, single digits. MSI is also pretty solid on consumptions, specially the B85M-P33
(this is not a standard micro atx is slightly smaller).
Ill try tomorrow when i have better light to lay over the NoFAN95 on my TJ08-E that still has the Asus GENE mobo on it for you to get an idea into how it would fit and how much it will need in space.