I just saw your post sorry, yes the all in ones can do it-just get one thats big enough.
Is this a serious band, seriously or a serious band this week??
These things are not cheap, even the all in ones, JBL has a nice package and have been making them and selling a ton of them for years- for live sound JBL needs to be looked at. After the portables-and they get pretty extravagant your looking at separates.
I have used Sweetwater for years...solid company, not going anywhere and they have very knowledgeable staff.
http://www.sweetwater.com/Musicians friend is another equally as stable...
http://www.musiciansfriend.com/