I currently have a an early 2008 Mac Pro, dual quad core 2.8, 18GB RAM, AMD Radeon HD 7950 3072 MB graphics card (PC card flashed for Mac), 128GB SSD, with my photos and my Lightroom catalogs stored on a 4TB Western Digital Black 7200 RPM drive. Attached is a Dell 24 inch IPS panel monitor. There is really not much more I can do to it in terms of enhancements. It is painfully slow in Lightroom and Photoshop CC. I also have a mid 2009 15 inch MacBook Pro to which I added a 128 SSD, discrete graphics card and 8GB RAM. It is also painfully slow in LR and PS. The battery only last about an hour or 2 (I am looking for a replacement), but otherwise both computers work fine for family use and I plan to keep them. It's time to buy a new computer for only me to use with the primary focus on photo editing. I use LR and PS and have an older version of On1. So the first question is do I go with a 27 inch iMac or a 15 inch MacBook Pro. I only take photo trips 2-4 times a year where I would want to have a laptop with me. If I get the MacBook Pro, I'm going to want a better and bigger monitor which I will need to wait about a year to purchase. Both systems will require external storage (possibly a NAS although I do not know how that will work with LR). If I get the iMac, I'll probably get a 13 inch entry level MacBook Pro for general family use and my trips in about a year. So the other questions are i5 or i7, which graphics card and how much SSD storage in the computer? My research indicates that the difference between similar MHz i5 and i7 processors is only about 10%. Am I better off going i5 and getting a better graphics card? Should I continue to store LR catalogs on the drive with the photos? Should I get a lesser computer and get a NAS? I shoot with a D500 and do not foresee the additional expenditure that comes with FX in my future. Any insight you can give me would be much appreciated.