Hi is absolutely a Storr's monitor. You get them with speckles and spots as well sometimes, we see them like this in Europe on occasion. Fact is most Storr's are very unattractive but you get exceptions.
I will send a shot of his tail too to prove what i am saying. Classic Storr's with spines in the right places. (see link to pic further down)
Let me draw your attention to some other photos posted by a well respected keeper that refers to "Storr's monitors showing unusual markings"
Varanus storri Look at the very bottom right for the pic (NOT the top pics).
Notice how these males have the same cream speckles and spots all over.
Also this picture by a previous keeper is very like my male but not at all like the one used in the initial comparison (which is almost uniform brown)
Storr's monitor (Varanus storri) at the Australian Reptile Online Database | ReptilesDownUnder.com
Another example is here where the breeders actually comment on the huge variability of V.storri markings and you can see an illustration on the right of the text. Compare the male in the bottom pic to the animal used as a comparison vs gilleni at the beginning if this thread - it is far more beautiful and also similar to my own animal and the examples given. Note also the marked difference between the two V.storri examples in their photos.
http://www.canadiancoldblood.com/storri.html
The sunset had screwed my initial shot so i will attach a new one of my own storri showing his actual background colour.
http://imageshack.us/photo/my-images/594/backvs.jpg/ - note typical storri tail. You will see he is just like the examples i have shown you. Admittedly the colour is unusual (the photographer even includes that comment in the first caption) but they are storri nonetheless.There are drab Storrs and there are pretty ones - a very variable species. It is possible there are more than just 2 subspecies but at the least there is a prettier locale with a smaller range. Opinions on taxonomy change all the time.
Lets look at some Ackies now
http://www.australianaddiction.com/FR_ackie.jpg http://www.hoglezoo.org/meet_our_animals/animal_finder/picture-677?_nox_ http://www.proexotics.com/sept_24_03_pics/monitors/Original Files/e yellow ackie juvie 8-03.jpg
Clearly an entirely different species to my own animal and the other examples i have provided. V.primordius, another dwarf spiny tailed monitor, is also clearly distinct from either acanthurus or storri
http://www.flickr.com/photos/smacdonald/2621703102/in/photostream