When you look at developers, the lower price points for the Pi has produced some excellent applications. After seeing the Pi put to use to run an entire animated Christmas Light Show, I bought a Pi B+.
Sometimes your purchase decisions are based on finding the application you want to run and then buying the hardware that will run it.
If you are into synchronized Christmas light displays on a budget, you can't beat a mix of Vixen, X Lights/Nutcracker for content creation and loaded on a Raspberry for scheduling and playback.
My setup is using addressable LED pixel strings, Falcon Pi Player on a Raspberry, connected to a DYILEDExpress DMX Bridge using e1.31 protocol. The entire control hardware is under $150 in hardware. Only major expense is buying LED lights which scales with your display size.
For more info view the link below for technical details on the show that has me planning next year's show.
View an excellent example of a Pi running a Christmas show. http://johnsonlightshow.com/