In reply to Flinticus:
You could consider the Exped Cetus II UL, a low profile, 2kg, outer-first tunnel with a spacious vestibule. I have seen it online for around 400.
If you are more in favor of a free-standing, dome like tent, have a look at the Big Sky Chinook 2p (although a bit above your budget). Outer-first, two vestibules, and the option to leave one of the poles at home when you expect less windy conditions.
Post edited at 09:44