Modena: This is the area of business in which i personally take enjoyment from, the Marketing aspect baby!
I alone have probably thought up/played with close to 10-15 phrases & slogans while determining which one fit my business best.
I think a good basis to start your quest for the most effective and catchy phrase is to determine specifically what you and your business delivers, how its different and most importantly....what you think sounds the best.
In my business ad/flyer (i should post that on the DC to share with you guys one day) my slogan reads, "Professional care at the comfort of your home."
In addition to that, as my sig states....i use "Delivering Excellence isnt expensive...its pricesless," as an effective and informative selling tool to my clients. I have an image in mind that i try to mold my business into, good work yields good results.....i aim for excellence.
PM me for more questions, id be glad to chat with you and juggle some idea's.
Goodluck.