Hi Luke, that sounds a real beasty.
There's been a lot of discussion elsewhere about the use of isolation transformers recently, and I feel there are still some important points to be raised.
Trevor made some very good points about the set up at a former place of work, however these may not be appropriate for a typical domestic setup.
Firstly, why do you want to use an isolation transformer at all?
1)To provide electrical seperation to one item
2)To provide electrical seperation to several items
3)To block any DC apparent on the supply
4)To reduce any common mode noise on the mains supply
5)To convert from one supply system to another eg T-T to T-NS or T-NCS to IT.
Secondly, what kind of setup will you use?
A permanent installation?
A bench fed from a single 13A socket?
Thirdly, what earth do you intend to use as you bench reference?
Do you intend to bring in external earths eg from an antenna bolted to a metal mast.
The prime reason for using an isolation transformer is to reduce the risk of electric shock. This must come first and foremost over any technical reason for using one, eg working on ac/dc sets or live chassis tv's.
If you can provide more detail of your intended setup, then I can advise you better.