HP5+ and Rodinal does not equal grain. It's how you develop it. Look at this for an ei of 3200 http://www.flickr.com/photos/peterbc...57622674774965 . Anyone using rodinal for any length of time has a tecnique to give them any look they want.
1) swirl your "cup" gently like a fine wine to control your highlights.
2) develop over 10 minutes for lower contrast and finer grain
3) develop under 5 minutes for sharpness and finer apperence of detail - with more grain