<p>Since you have the 50, suggest a 28/2.8D and a portrait/short telephoto. Maybe the 85/1.8D or 105/2.8 Micro, or 105/2.0D.</p>
<p>If you'd consider a zoom, the 28-70/f3.5-4.5D is a remarkably good lens that can be had for a song these days. Also, the 80-200/4.5-5.6D is surprisingly good, again, for a song.</p>
<p>Good luck.</p>