Very interesting shot Mick, love the colours and great mood. I think a selective sharpen on the immediate foreground would set it off nicely.
A few niggly things – there seems to be a halo around the building on the left (could be a result of pushing the saturation ?) and the horizon is slightly off. For a first attempt, this is super. Look forward to seeing more.
Second attempt at HDR using only 2 images and the highlight and shadows options photomatix, i used the first and last exposure of a set of 8
fixed the horizon and some sharpening in the foreground as suggested by Ali. Contrast levels and curves done in PS CS 2