I finally got round to modding GTAIV with the latest ENB mod called "ICEnHANCER". I haven't tweaked the config files much yet, but I will start messing around with it soon. I heard the mod really melts your GPU so I've been keeping an eye on my temps. I managed to play a mission with ENB on, which was fucking awesome i might add. And the temps didn't go above 60 Degrees Celsius, so I'm not too worried atm.
anyway, couple of pics
There is still loads of settings I have yet to play with, like FOV, light shafts, Lens flair etc. the grain and colour is a part of the post process filter from ICEnHANCER.
I'm so gonna play through the whole story with this on now!