Doesn't the Iscan Pro only scale up to 480p? Or was that the Ultra? If so, you would still be using the internal scaler of the display to get up to 768p.
I'm sure there are great prices to be had on the Pro, now that the Iscan HD, HD Plus, and VP series are out (or have themselves been succeeded and replaced). But despite the presumably good price, I doubt you would be getting much for the money. The SIl504 chipset is what I think DVDO formerly used, and I'm sure it was (or is) great. But the scalers which are built into contemporary TVs may have caught up with it.
So if it is limited to 480p, my opinion is that even if it's a deal, only get it if it's to be used with an enhanced def (not HD) TV in another room.
I once got a great deal on a Faroudja NRS DVI scaler which was previously around $4,500. I paid around $700. I kept it for about 6 months before reselling it and swapping back in a DVDO. Maybe that was a bad choice, but I had practical reasons, and I felt that the formerly oh so exclusive Faroudja DcDI which was now being integrated into so many TVs and DVD players was probably not no different. In others words, even if the Iscan Pro and Faroudja NRS were great in their day, maybe the proprietary scaling solutions being integrated nowadays in TVs and DVD players are comparable to or better than those outboard aging solutions. I'm not maligning them, or even addressing the new Iscan and Faroudja solutions.
Lastly, with a new (October 2006) TV, it has to have HDMI inputs, right? Probably several. The Pro, at best, might have DVI output. Isn't DVI limted to 8 bit whereas HDMI can be 10 bit? And do you really want to have to use a DVI to HDMI converter?