I would forego the 'gamingness' of the XPS range if it's something to compare against an iMac, and go for a Vostro or an Inspiron (I'd reco Vostro, simply because it'll be a cleaner install). You should be able to cook up an iMac-pulverising spec for less.
I have a Vostro 400 which I got in a bundle with the 2407WFP monitor, and comparing it alongside the 2.8 24" iMac I also have it's amusing how comparatively little the iMac offers in terms of spec for the price, even given the design premium. Noisewise it's kind of a moot comparison since the iMac can't keep itself cool anyway and is situated right in front of your nose so it HAS to be quiet, whereas the slightly noisier (and notably more powerful) Dell system unit can be tucked away under the desk.
Of course, it's not all about spec. I'm sure the... shall we say, less informed Mac apologists, can think up of a whole lot more reasons. Really, ultimately it's about whether you want the Mac experience, which obviously is unique to the iMac.
Given the choice if I was limited to one machine, unless I needed something to run under OS X I'd go for the Dell, be assured of an upgrade path over the coming years especially in terms of GPU's and spend what I save on focused software that exceeds the capabilities of iLife / iWork for what I wanted to do.
However, the iMac is in itself a pretty nice all-purpose noodling machiine.
I have a Vostro 400 which I got in a bundle with the 2407WFP monitor, and comparing it alongside the 2.8 24" iMac I also have it's amusing how comparatively little the iMac offers in terms of spec for the price, even given the design premium. Noisewise it's kind of a moot comparison since the iMac can't keep itself cool anyway and is situated right in front of your nose so it HAS to be quiet, whereas the slightly noisier (and notably more powerful) Dell system unit can be tucked away under the desk.
Of course, it's not all about spec. I'm sure the... shall we say, less informed Mac apologists, can think up of a whole lot more reasons. Really, ultimately it's about whether you want the Mac experience, which obviously is unique to the iMac.
Given the choice if I was limited to one machine, unless I needed something to run under OS X I'd go for the Dell, be assured of an upgrade path over the coming years especially in terms of GPU's and spend what I save on focused software that exceeds the capabilities of iLife / iWork for what I wanted to do.
However, the iMac is in itself a pretty nice all-purpose noodling machiine.