I use a Eureka Woodlands 300 full fly tent. I paid $100.00 Canadian. It is 7' x 7' is is classed as a 2/3 man tent. Maybe it could be used as a 3 man on Brokeback Mountain but anywhere else it's only good for as a 2 man. I use it for myself with lots of room for gear.
When I bought the tent I tested it in the back yard during a huge storm. It stayed completely dry. It is a great tent for the price. It folds up small. I paddle out of a Tempest 170 and a Tsunami 140. I have used this tent on multiday kayak trips with both kayaks. A great tent.
I spent a good while looking for a full fly tent with a square pbase in the size of approx 7' x 7'. This was the best tent I could find to meet my criteria. It was just a bonus that the tent wasn't overpriced. I don't know about other people's preferences but for me, square based tents allow for more efficient use of the tent.

Check the link out: http://www.eurekatentscanada.com/products/view/78

It will fit fine in your Soltice GT. Good luck

Chad