Should I have used "nu"?

To: lojban@yahoogroups.com
Subject: Should I have used "nu"?
From: Brian Eubanks <jorne@eubot.com>
Date: Tue, 25 Jan 2005 13:15:55 -0500
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217


Now I'm wondering if I should have used:

ko viska le nu la spat. bajra

instead of

ko viska le du'u la spat. bajra


mi'e la iuban.