The clear FMQ foot for your Brother will work fine. I prefer clear because you can really see what you're doing.
I found all of my Brother feet on Amazon at competitive prices.
Some people prefer the guide (I do! I can't sew straight without it), and others don't like it (if they sew over pins or if they don't like moving the needle--which you sometimes have to--or if they have other markings on their plate that they find useful).
Yes, I like the quilting guide bar for straight-line quilting. Lately, however, I've been using blue painter's tape.