First, depending how much power you require.....for small venues a Roland CM30 and others would do....but for larger venues....
I would consider the Yamaha DBR series....active speakers, there is a 10, 12 and 15 inch, the smaller has 700 Watts, the larger both have 1000 Watts, and can be use in different ways, like a wedge monitor, or if needed as a main, can be put also in a speaker stand and the best part that is very light in weight in comparison to the Trynor amps that are more suitable for guitar.
Keep in mind that when a manufacturer makes an amplifier, the speaker is also designed to handle those particular frequencies, the guitar has highs and middle range, the keyboard has a much wider range, therefore, the speaker has to be different.
Just my 2 cents.