You shouldn't choose weapons base on your atk rating when equiping them. Your atk changed only because the difference of your weapon skills. For example, if you have 50 skills in 1hs, and only 10 in 1hb, then your atk will be lower if you put a 1hb weapon on.
Assuming equal skills, your atk rating will be the same when you equip any types of weapons. Keep in mind other factors will affect your atk, like +STR and/or +atk on weapons.
edit: I just re-read your post and I think Tarv answered your question correctly.
Edited, Sat Jan 17 23:23:46 2004 by Assailant