Honestly on my desktop computer (the dying one) I use mainly only an internet browser (and would be happy to have the color management in Safari) and photoshop. The rest I can do on my Acer laptop (what I am using right now).
I had a small look last night and I like the macbook pro.

Will need to look into it more to figure out what questions to have answered because at this point I don't even know what the questions all are let alone the answers to them.
I have three external hard drives and would likely pull out and box the harddrives in my dying pc. Would I be able to use those with a Mac? Do Macs also use external HDs?