Your jacket is about the same weight as my (similar) Montane , I am not prepared to spend the extra money either to save 200 g.....
Brett's offer is pretty good at well under 1/2 price of the new one (AU125= US 100). You do need a pole with the Squall , maybe Brett has the one from TT.
The Rainbow is out of stock at the moment (according to the TT site) , from memory it is around $40 AU for postage. I have had 3 tents sent from Tarptent, they all arrived in 5 to 7 days.
( note the drop of the AU$ from 98 to 80c US in just a few weeks)
At the moment I am playing with the Akto , just to get the feel of it. I must admit that I do prefer the side entry. Having said that, apart from my backyard tests , I use the Contrail .
This shot tells the story....
From left to right : standard double skin tent, the Akto,the Rainbow and the Contrail....