An SSD produces very little heat.
Hard drive produce little heat, it's only when you get large numbers under near constant heavy load (ie server arrays) that the heat start to build up, ideally you do want some air flow over the drives simply because they are the part most sensitive to heat in a pc, ideally they never want to go above 40c
ODD and card reader produce almost nothing.
cramped doesn't have to be hot as long as it's got good air through put, it's cramped with no air flow that you get real issues.
TJ08e is one of the best matx cases for an air cooled system well designed to create a constant focused through flow of air.
ps also look at the PS07b
http://www.scan.co.uk/products/silve...icro-atx-black it's slightly cheaper, same internal frame just a different bezel, plastic not aluminium, but with a door to increase noise reduction and two 120mm fans instead of the single 180mm air pen