Harry Higley makes a set of steel blocks (they look like big dice) that have varying holes for different size drill bits. Work great and keep the drill perpendicular to the surface. I also have two sets of finger drills and, for balsa and light ply, they are great. Available through Tower Hobbies or direct from Harry.

http://www3.towerhobbies.com/cgi-bin...&P=WR&I=LXL780



But I do love my drill press. Mine is a relatively inexpensive Skil 3320 and it is a much used item for way more than model building. I use it much more than my Dremel for the jobs that come along.