Welcome,
5/6k would get you a nice auto TT, start looking on the classifieds or contact Jurgen at JM Imports with your requirements. As stated manuals go for alot more so unless you can save a bit more go for an auto... and dont be put off by the auto box they are sweet Scotty's five steps to buying your Supra.
1. Join here and pay membership (the best tenner you will spend)
2. Search the classifieds and or contact JM Imports
3. Forget Ebay (members cars on here will be known and generally well serviced/maintained)
4. Dont limit your search to your local area. (be prepared to travel a bit)
5. Dont buy on looks alone read/print this thread when viewing http://www.mkivsupra.net/vbb/showthread.php?t=67644
Then buy, drive and enjoy:D
scotty