Hi there, i am up in dundee and fish the tay from time to time. The perth + district has a lot more water but the stormont water can be exeptionally good depending on water and of the best of that bunch would be the rome croy water!!..
If you like a variation in your angling then p+d would be your best bet as the lower tay as i am sure you know can be a really big water.
I had a similar situation this year as your self and ended up getting a ticket for the south esk(kirriemuir a/c), which can be a great river. This is £135 for non residents.
If you want any more details drop me a line
All the best Richard