I started writing a RoR medical office application. Then I thought what if I wanted every patient to have an RFID card and perform measurements (BP, Weight, etc

I started writing a RoR medical office application. Then I thought what if I wanted every patient to have an RFID card and perform measurements (BP, Weight, etc.). I found an RPi + Arduino project with peripherals, manuals and all I could ask. That I can handle, building everything from scratch (from software to hardware) would take a tremendous amount of time (due to lack of expertise on my part). So as you said, even if you get me an x86 board at 50 USD I'd still go for Arduino.