My iMac, the first Intel dual-core version purchased right after Christmas 2005 (17-inch screen), is starting to slow down and the monitor is starting to act up. No problem... the machine has been used heavily, has been drop-dead reliable and owes me nothing. But it is time to start shopping for a new Mac. I also have an iPad for daily e-mail, web browsing, etc. But I prefer to do my photo (and potential video) editing on something bigger and more powerful. The question is... another iMac or a Mac laptop? While I want more monitor real estate than the iPad can give me, I don't think I need 27 inches. A 21.5 iMac would be fine. But how about a 17-inch MacBook Pro? Of course, it would be great to get another 5-plus years out of the new machine. So, an i5 or i7 processor... and how much RAM to "future proof" the machine - at least to a reasonable extent? And - final question - I've been using Aperture 2 and occasionally iPhoto. Stick with the latest version of each or go with Lightroom? What are the Mac guys on mu-43.com using?