I wouldn't buy anything you hadn't seen in the flesh, as it were.
Vango do a tent similar to the one you were looking at for half the price, available at go outdoors and online, I can't remember it's name though.
For me a tent has to be taller than me so I don't have to crouch down to get in, and have separate bedrooms.
We have a massive 8 man one (make me an offer and it's yours!) that was fantastic when we had a big van to fit it in, but it's no use to us now.
I would always try and get a sewn in groundsheet too.
As for equipment you can go with just a tent, sleeping bag and stove or you can buy carpets, curtains, kitchen sink. Everyone has different definitions of "bare minimum" don't they?!