I used to use a pair of EV SX500's and a Martin Audio Bass Bin, however for 1 person to lift all the time it used to crease me by the end of the night. I now use a pair of Mackie SRM450's (think that's the make as I'm not in front of them at the mo).
These are spot on and for vocals and keyboards they are crystal clear.
I also take the bass bin out for larger venues only.
Mackie, EV, Martin Audio all good stuff.