In all seriousness, I agree with these other posters. I have a Raspberry Pi as a controller and run both Antminer U2s and a Gridseed Orb (aka Mini or 5 Chip), and needless to say there will be a return on investment, but it will be a year or so. I would recommend Antminer U2 or preferably a Gridseed Orb/Mini/5 Chip, because the Gridseed can do either Scrypt or SHA256 or both types of crypto currencies. Other than that. If you want an expensive, but more power friendly dual miner, then get a DualMiner. The DualMiner does 70kh/s for Scrypt or in dual mode 500Mh/s SHA256 & 40kh/s Scrypt.
You can find the above devices on eBay easily for under $25. If you want to make serious coin, then expect to shell out thousands of dollars or of your local currency to make it big, but remember your ROI will take longer as time goes on.
P.S. - I don't intend to get rich, just want a fun hobby and make some "coin"
