Dual 867 MDD vs. Dual GHz refurb. QS?

[WannabeSQ]

At Powermax, the refurb QS dual gig goes for $2149 and the new Dual 867 with superdrive goes for $1899. Is $250 worth it for the faster processor in an older model? The new QS dual ghz goes for $2349, and the new MDD dual ghz goes for $2494. What is my best option? I want a superdrive, but dont care about HD size as I already have a few of my own. The Video card doesnt matter cause i will probably be using a Radeon 8500.

I do audio editing with Pro Tools (waiting for pt6 and OSX compatibility) with a Digi 001 (host based protools, as opposed to their own DSP cards) I also plan on doing some Final Cut Pro work, possibly photoshop. I hear they fixed the problems with the MDD boxes and my protools card with the new REV so that is no longer an issue. I have a feeling that using an 18 channel 24 bit 48khz audio card would benefit from the DDR ram on the MDD models. Am I correct in assuming this?

To sum up, Im looking for the best bang for my buck, but also want good performance for Audio and Video. I plan on buying this in January, is something new coming that I should think about too?

Edit is for minor grammar errors

[Sun Baked]

Unless there is a specific reason for absolute speed now, then the newest architecture over the long haul is generally the best choice at similar clock speeds.

[Nipsy]

The new Dual 867 has been appearing as a $1500 refurb lately...that leaves you $650 to add an AO5 Superdrive (pricwatch has them for under $300).

Although I haven't tried yet (damn thing won't crash), you can overclock the 867 to 1GHz in open firmware...