Diane,
You might check with the gentleman on this Forum who is contemplating selling his 97 RT-10. This was the first year of the 450 hp RT-10s, has the forged pistons, 17 inch rims ( easier to find tires and less bucks ), has both tops, which was uncommon in 1997, only 15,000 miles so less than half of the first one you looked at, and apparently it is stock except for 3.55 gears -- important for you to get through Customs in Jolly Ole England.
Should be in your price range and there are only about 60 other cars like this done in 1997 --- rare find.
Best Regards,
Bill Pemberton
Woodhouse