Tents. Such an emotive issue.
My first experience in the Tasmanian wilderness was with a mate in his cheap chinese copy of a tunnel tent that got destroyed by high winds on a mountain one night, while we were in it.
My first tent was a Hallmark Snowcave - do a search, you will find lots of posts from me on it and some photos too. Not much point though as it is not available any more.
It was a two person tunnel tent with two udeable vestubles.
After about 18 years, I retired it and boughht, after MUCH research, a Hilleberg Nallo2. It is half the weight.
Price - used to be in your range, but with the dollar the way it is, over $800 now
Weight - 2.1 kilo's. Half the weight of my old tent.
Season - true 4 season, lightweight tent.
Only one vestuble, but it's quite big and serves well. It was the biggest sticking point for me when hunting for a new tent - there was the Hilleberg Katium which has two vestubles, but is extremely long.
One vestuble has been the easiest thing to adapt to - it surprised me.
There's the Nallo3 if you want more space - same length but a bit wider, though this one serves me and my wife well - more space than the old tent because it's a bit wider inside.
Now for the best bit - you say you are looking for two tents. With this tent, you get two tents...
In fine hot weather, just take the outer. The inner is attached to the outer and when you erect the tent, it all goes up easy.
Peg down the door (two corner pegs) or the narrow end of the tent - doesn't matter.
Slide the 2 poles in (colour coded - red tab to indicate which pole for which sleeve)
Pull the other end and peg that (two pegs)
Peg out the 4 guy ropes.
The inner is attached to the outer with several toggles that easily remove. So if you just want the fly, leave the inner detached, and put a spaceblanket down in the fly. And of course pack the mozzie repellent.
I wouldn't consider just the fly here in Tassie, but in Brisbane... I grew up there. Too hot.
http://www.moontrail.com is where I got mine from.
There are heaps of reviews on the net if you want to go looking.
Hope that helps.