Playing around with Raspberry Pi and Arduino can be a lot of fun. Raspberry Pi 3 has even more power than its predecessor. It has a 1.2GHz 64-bit quad-core ARM Cortex-A53 CPU, 802.11n wireless LAN, and a Bluetooth model. It is compatible with Raspberry Pi 1 and 2.
The board has a faster processor that offers up to 60% increase in performance in 32-bit mode versus Raspberry Pi 2. You can still power it using a 5V micro-USB power adapter. Costs only $35 at this time.