The Camelot Technology Roundtable is reputed to be absolutely excellent. It comes with an internal digital line doubler, 24/96 up-conversion, and their "Dragon" 5.1 jitter reduction for 5.1 AC3, DTS and other digital formats. It also comes with their own powered S-Video cable tech. I do believe they chose DVDo's (now Silicon Image) progressive scan chip, which isn't quite as nice as Faroudja's DCDi. At $3500 (dropped from $4k), this unit is a relative bargain compared with some of the other units in its class. Part of its bargain price is it's Panasonic A110 chassis, which already comes with an excellent transport.
Tag McLaren's DVD-32R is another world beater, with a "digital only" design (not digital straight through though, as the DVD consortium does not allow that). It even has DVI output. At $6500 including the progressive scanning, it is a bit more expensive, but when you're asking for the best, you know it's going to cost. I got to say, as these things go, the DVD-32R has a world class looking chassis.
If you're a bit more of a sound man than a video man, the Ayre D-1x (with the VR2 progressive scan card, of course) may be the way to go. The SIL503/504 progressive scan chip I don't like as much as the Faroudja, but you can't fault them for using incredible 24-bit Burr-Brown PCM1704 DACs. It's about $8500 including the progressive scanning.
Faroudja's upcoming DVD player/scaler combo is supposed to be one to watch for. I'm not sure what the expected price is, but it should be incredible. Hopes are it'll be digital from start to finish since Faroudja isn't bound by the DVD consortium. If so, they will rule the high end market. It should come out at about $10k, though this may change.
I know I'm leaving out a bunch of favorites (from the likes of Proceed/Madrigal, EAD, Meridian, Theta, etc), but I'm sure someone else can cover those. Everyone has their own favorites. When you're spending upwards of the low 5 figures, the best for one person may not be the best for another. Look, listen, and decide for yourself. You'll be happiest that way.