I had to make the same decision about a year ago
I stayed with a PC for 4 reasons
A Mac was more expensive than the equivalent Dell PC ( I bought a Precision T7500)
Some, not all, of my software was not cross platform, so buying new Mac software would be even more expense
A program I was thinking of using for future project, would not run on a mac
I would have to learn a new operating system
If you want run LR4 and CS5 together you need not less than 8 GB RAM, I use 12 but 24 would be better
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