I have quite a lot of movies in either AVI, MKV or MP4 format, I know there are a few TVs that will play back this format from an external hard drive but are there any Blu-ray players that will play these formats through the auxillary function. I currently use a PS3 for Blu-ray but do find it quite noisey so thinking of changing

My LGBP620 does it with only the occasional misfire.
Some Freeview boxes will also do it but with much less reliability.

My son uses an external hard drive on their Sony S390, seems to play everything they throw at it.

You could always try Universal Media Server to play through PS3

GD