I was told i can switch from a PC to a Mac at work to begin doing Mac/iPhone Development and I am struggling to decide which machine fits my needs better. My goal will be to have a single machine for both PC and Mac development. I also will carry it to meetings 2-3 times a day and home with me at night. I currently carry a 13 and run parallels on it once in a while but not every day. My budget needs to stay around 2000 but could go over a little. I'm struggling with the classic struggle. 13 for portability or 15 for Power. Here are my options. I am looking at refurbished items. 1: 13 Retina 16gb/512ssd ($1699) - This has plenty of memory and storage for what i need and should run Parallels fine with 16Gb but with only two Cores, I fear it will struggle with running Parallels all day (at work). I carry a 13 now and love the size/power combination in a secondary machine for sure. 2: 15 Retina 8gb/512ssd ($1699) - This has plenty of space...and I know parallels will run ok with 8gb but that doesn't leave much head room. Also this is a bigger machine than i am used to lugging around. 3. Splurge for 15 Retina 16gb/512ssd ($2199) - I'm confident this would fit my needs for a while....but again...lugging it around might not be awesome. Anyone out there that spends a fair bit of time in Parallels/Fusion that can offer advice.