If you think this may be interesting to you but you just aren't sure yet there is a trial version available at
http://www.cricut.com/messageboard/tm.aspx?m=1311421&AspxAutoDetectCookieSupport=1
It only allows you to use the cartridge that came with your machine e.g. George if you bought the initial personal cutter. But at least it gives you some idea of the potential of the program before you buy.
Here is a box I have made for Emily's daycare mum for the title I used George and the Design Studio program to weld the letters.