So since my nMP order has been in "deliver in February" land for a while, that's given me time to waffle, and debate, and ponder and.... So, the choices.. nMP Quad/D300/32/512 + external storage, for ~$4500, or a used 4,1/5,1 for between $1k-$2k. I'm upgrading from a 1,1. Need it for LR, PS, WoW. Currently looking at a 2009 4,1 dual 2.26 quad with 22G ram and a slngle 2TB drive that's being offered for $1500. Thinking about offering the guy $1200 and see what he says. While I won't gain much in single core speeds, I'll gain current OS upgradability, and room to do future updates, including a current video card. Or should I hold out for a 2010 5,1 with a faster single core speed? Thoughts?