What keyboard amp should i buy?

I've been searching around online and browsing the price of keyboard amps. i am hoping to spend $300+tax or less. i have a takamine jasmine acoustic guitar, charvel charvette, dean playmate, casio ctk-710, and alesis micron which i plan on playing on the amp. the micron is mostly what i am purchasing an amp for so just keep that in mind. i am planning on using this to perform in small settings (cafe's, coffee shops etc..) but also would like to be able to play at parties also. i purposely did not mention what i was looking at in order to prevent bias.