Start out with XB, and if you want to you can get the System but it may be a bit tough, and if you don't know the revolution cut, very hard.
I wouldn't reccommend getting Motion as it is a bit higher in difficulty, and Flourishes from the Trilogy is harder than the System. (so I've heard)
And for Coldsleeping's comment, DO NOT get Showoff 3 as a beginner, it is way to complicated for you.
~PaCo