1.66GHz vs. 1.83GHz  - How much difference is there?

I'm considering buying a Mac Mini for my fiancee very soon. I do have a question, however. How much real-world speed difference is there between the 1.66GHz and 1.83GHz models? I will be upgrading to 2GB RAM with aftermarket memory for her either way.
She uses Photoshop CS, Adobe Lightroom, Aperture, Safari, iChat, and iTunes most of the time.
Do you think the 1.83GHz model is worth the extra money or not, and why?
Thanks!
Dave

The difference between the two in processing performance is barely noticeable - though it IS noticeable on applications requiring heavy CPU load, such as when rendering video or applying Photoshop filters. It's not a significant difference however, and as with the mini's performance overall, it is somewhat masked by the relatively slow hard drive, but in these uses it gives the more expensive mini a worthwhile edge in performance. In other software, such as iChat, Safari, Mail, iTunes etc, it really won't make any real difference other than helping the system run a little more smoothly and make transition from window to window or application to application a little more seamless. Very marginal improvements.
Really, the greater expense of the top-end mini is more to do with the extra drive capacity (80Gb instead of 60) and the inclusion of a dual lawyer DVD burner in place of the standard CD writer of the cheaper unit. All in all, not a great deal for the extra $200, particularly given the fussy nature of the slot-loading DVD burner.
In my own view, better performance could be gained for less than that extra $200 by hooking up a faster external FW drive to the cheaper model and using that as the boot volume, but if best-possible CPU performance is needed (and with Photoshop in particular it's never a bad idea to have more power) then the $799 model with the larger drive and DVD burner is perhaps wise, with the possible subsequent addition of a fast external to use as the boot disk to then obviate the masking effect of the slow internal.

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