You'll be doing more than just tailwheel differences training if you go from a Pa38/28-C152/172 to a Decathlon or a Pitts. As your allocating 5 days, consider the instructor and aircraft type before the location. If buying/joining a group you might just get an instructor and use the aircraft you'll be flying..
And check if you've to pay for each landing - it could add a lot to the cost.