Looking for new computer

I've just started using AutoCAD and I have an old computer which is slowing down a bit and want to start looking for a fast machine with large hard
drive and one that also can store AutoCAD files onto DVDs.
I've looked at the 30" monitor by Dell and I REALLY like it. I've grown so used to relating to a 24"x36" piece of paper, I'm not liking reading my drawings on a 17" monitor.
Any comments and/or suggestions?
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