I'll be honest with you on mining... While the S3 or the S3+'s are tanks you have to have 2 or 3 of them to have at least 1TH. I have 2 S3+'s personally and they run fine but don't expect ROI at all on really any hardware now. Keep it as a hobby otherwise being all about making money or a large amount of profit will take its toll. You need to take into account how much you'd be spending on electricity as well.