A BB is a good investment. You will find you can do a lot with them. I have fixed roads, spread gravel, and landscaped with mine(took a hill down). And occasionally take out some small unwanted brush. Also, I've tilted it and made ditches with it also.
I have a 5' BB and it fits my machine perfect. I have a 5.5' Rototiller and I have to be careful going thru gates and other things, as it sticks out on both sides of the back wheels. Something to think about.
Everything Attachments has some great videos on implements on YouTube. The only problem is...you're gonna want another toy....

....I meant TOOL!
