im in the same situation as you mate.....mine tends to look best when its mid-forehead length on top and slightly shorter back and sides, then i can flatten it a little b4 making it curl up, concealing my scalp and showing me to have a reasonable head of hair.....basically, if you saw me down the street u wouldnt think i was balding (not sounding big-headed, have been told so by friends).
A bit detailed but as a fellow thinner u've got to realise u need to put a bit more effort into styling ur hair to conceal the thinness as much as possible!