Looking for an upgrade from my Dell 1558 Studio Laptop, featuring core i5, 2.4GHz, 500GB Hard-disk, 4GB RAM, 64-bit Windows Ultimate OS. But, not satisfied with Dell at all. Had to replace the battery after 8 months, lots of panel gaps, screen panel is so flimsy and starting to loose, recently WiFi device stopped working, and had to re-place, and when windows Ultimate was installed, Dell Dock disappeared, unable to see the on-screen display for sound display, WiFi turn on/off, brightness display, Pinch zoom in/out no longer works, and now, it's heating up a lot than before. So, I have decided to service this once more, and keep this at my dad's office. Was doing some research through net, and have decided to go for MacBook Pro with Retina Display or MacBook Air. Are APPLE laptops really trouble free? And, if Windows OS is installed along with X Lion what will be the disadvantage? Will it affect the performance or anything? Which is a better option to go for? PRO with Retina Display or AIR? As far as the configurations are considered, I definitely want something more than that of Dell's. So, looking for i7, 8GB RAM, and hard disk, minimum 500GB. And i will be using high-end CAD software most of the time. Thanks in advance!