labels for CD/DVDs - programmatically from script

Hello image gurus,

I've spent a couple hours trying to get text in regions of a square background.  First I just want 2 regions, the upper portion and lower portion of a CD.  (I'll be using this with lightscribe DVDs)

I've avoided "-draw" because I didn't see a way to center horizontally.  So...

I've tried doing parenthesis for this regions and then doing a -composite into the larger background.  

This sort of works:

convert  -size 480x480 xc:skyblue \
	\( -size 460x140 -font Helvetica -pointsize 24 -gravity center \
		label:'Red Hat Enterprise Linux\nStuff' \) \
	-geometry +0-150 -composite \
	\( -size 460x140 -font Helvetica -pointsize 24 -gravity center \
		label:'Version 5.6\nx86-64' \)  \
	-geometry +0+150 -composite \
	gif:- | display gif:-

The bottom text shows it's resized larger during compositing.  I'd like the two 460x150 region with a fixed sized font to be composited as is.  (trimmed in length of they are too long would be fine)

Any help is appreciated,
Scott