Nice bike and nice build up.

Regarding the decals...

If it were mine, I would leave them be. I generally prefer to keep the frame looking as original as possible, unless its just horrible, which yours definitely isn't.

That paint scheme is pretty subtle. What follows is just my own taste and prefs. Ignore it if it doesn't suit yours.

With a light frame like that, I would try to match saddle and tape to the accent colors on the frame. You've got plenty of black working for you with the headset, bottle cages, rack and Brooks. I would consider trying brick red bar tape to match the decals. Here's some pics of a bike (not mine) of the color that jumped to mind for me.

http://www.cyclofiend.com/cc/2006/cc...ersey0106.html