The Avantage is the last model (the one before the EVO)
Not strictly correct. Though colloquially people kept calling the pre-Evo Aerospace the Avantage, the Avantage was 2005-6 only. See:http://www.breitlingsource.com/watch_de ... al_26.html
It had ‘Chronometre Certifie’ on the dial.
From 2007-12 it reverted to being the simple 'Aerospace', with 'Chronometre Aerospace’ on the dial. But as Roff says, despite retaining the same model number all along  there were successive changes, thus:
For 2007-9, plain dial, like the preceding Avantage.
2010-12, grill-square dial, numerals added at 1/2, 4/5, 7/8, 10/11.
Then, as we know, in 2013 they introduced the Evo, which had the following changes:
- dropped the grilled square in the middle and reverted to plain dial
- changed the hands, with skeleton hour hand and sharper minute hand
- dropped the 24-hour markings on the outer dial
- integrated the rider tabs
- grew it by 1mm
- applied the wings
- added 'Swiss made'
See for discussion of the Evo:viewtopic.php?f=1&t=47063
So in short (!) and as Kodiak says, if you want the plain dial (and confining this discussion to the Avantage-on era watches from 2005) you want:
a 2005-6 Aerospace Avantage
a 2007-9 Aerospace
a 2013-on Aerospace Evo
(However, just to complicate things, it appears that Breitling kept putting out plain-dial Aeros after having introduced the grilled Aeros in late 2009, I suspect because the grill wasn't very popular. I know that because I have a plain-dial Aero date-stamped mid-2010.)