Shim,
A couple questions come to mind. First, where will you be using the sound system?
If you will be playing for an audience, what will be the maximum size of the audience.
Also, what kind of music, Rock, blues, jazz, or a wide variety of genres?
Will the system be used for both keyboard and vocals? And, if this is the case, will you be firing the mic through the keyboard, or connecting everything individually through a mixer?
Answers to the above questions will go a long way in helping to determine the size and type of system that would be best suited to your individual needs.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)