Looking at the 15" i7 with 500gb ssd and 16gb of ram. Intel Iris pro graphics, etc. Use : mainly photoshop and lightroom for photo work. No video work. I'll also have CS3 Illustrator and Indesign loaded for some minimal poster and book design. Now a good a time to buy as any? I'd like to buy this week. I see the macrumors buyer's guide says 'caution'. What should i be cautious of?