Hi I am looking at getting my first Mac. I currently use an ancient 15" ASUS laptop as my main computer but it is well past its use by date and I need to upgrade. I use my computer for writing and also some photo editing. Not big on games but I'm an occasional user. I'm not sure if I should get a MacBook Air (with 8 MB RAM)or 13 inch Retina Pro (love the colour sats)and maybe get an external monitor. Or to go for something like an a 15" MacBook Pro or even an iMac and use my iPad for portability. Cost is an issue as it is with us all. I generally will be using the computer for research and writing but also for photo editing (want to develop (haha ) this area more). I've been perusing the forums and everything has it's pluses and minuses. iMacs can overheat badly, MBAs are minimalist in the ports they offer, retina MBP look awful on any browser but Safari - and they cost more than an Air. So I don't know where to start. I'm wondering if people who use the 13" screen all day get eye strain.I find my current 15" screen is a good size but the cost of the 15" retina MBP (with the specs I'd like) is a bit out of my reach.