Hi Marlie.
To be honest I'm not sure who has Airmatic on their 205. However the reviews all rave about it being great.
Maybe look/ask around the 350e threads because I think they have this as standard because of the extra battery weight in the boot.
If you can afford the £895 then go for it, even if it means deleting any other non essential options you've picked to offset the cost (eg 19" alloys, leather, metallic etc.)
Let us know what you go for,
Ant.