Skeksi,
your model looks really "clean", and if your experiencing troubles with subdividing or smoothing maybe your smoothing settings are off a little ?
Yes if you could create all 4 sided poly's your smoothing would be perfect but its often very hard to make every face a 4 sided poly and especially with subd's the 3 sided polys seem to pull the skin a little but its hard to avoid.
I don't think your model is the problem(atleast what you've shown from the side)
maybe you could post your smoothpoly settings?
or a smooth pic so you can be more specific with your problems?