What version did you use of A5?
The free A7 is the former "Extra" version, anyway.
Means, you already have a lot of options.
Whether you buy a higher edition depends on your needs.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt