im a former se-r guy, and i loved the sr20de in that car.
very smooth, somewhat powerful, and quicker than a gs-r with the same amount of mods.
but i just think its a little weak for a rwd car.
but if you have a dying ka, and just want an awesome motor, that might be a little underpowered, but makes up for it in reliability, and smooth powerband, then get a DE
if ultimate power is your goal, id say go with a DET from the start.

not a whole lot of differences, but im all for preventing problems, and making shit easier.