Other options:
Find a used copy EQ5 for sale for under $70. - no installation issues or limits. It doesn't have a lot of the newer features, but it's really good stable version.
Skip 6 ( used) or new unless it's a really good deal - under $100.
EQ6 had a limited number of installs per user.
Watch Eleanor Burns site at
http://quiltinaday.com/. She has periodically offered EQ7 on sale for $133.
Also, EQ has a lite version of EQ called Design Wizard:
http://www.electricquilt.com/Shop/QDW/QDW.asp
Priced at only $30, it's a nice basic entry to quilt design software, and should be able to do want you want.
If you decide in the future to get EQ7, you're not out much money.