Our company is going down the path to make an App (yay!), but have ZERO Mac/iOS experiance (but many do have personal Mac/iOS). Our purchasing dept is a bit of a tight wad, looking at 27" iMac (instead of tower), with dual SSD+HD. I think I an successfully argue the screen size avoids getting 2 separate screens (have one at home, wife uses it like a big screen TV!!) What minimum RAM? 4GB suffice? 1TB enough HDD? What else should I consider?