Hi Halo,
Firstly, DVI is a digital video connection first introduced in PC to connect to the TFT screens.
There are 3 derivities of DVI.
DVI-D - Digital
DVI-A - Analogue
DVI-I - Integrated: Both Analogue and Digital.
Since your Samsung has DVI-I that means you can connect a PC with DVI out or VGA and get a DVI connecter.
In terms of DVD players, there are some with DVI sockets that use DVI-D. Your TV will take DVI-D but you must make sure you get a DVI-D cable else it might not fit the DVD player as there is a physical difference (4 pins missing) between DVI-I and DVI-D. The Denons are proof of this.
You can also get DVD players with HDMI and get a cable that converts from HDMI to DVI for not a lot of money so you can also include these Players to.
All of the DVD players I have seen up to now have Prog Scan over DVI so there wont be any more flickering of Interlace. Also, these players can upscale an image to Hi Def resolutions (This doesn't mean Hi Def material though !). It just means that it take a 576 PAL signal and puts lines in by guessing them with their surrounding lines to make up 720. Strictly speaking, your LCD screen already does this (I'm guessing it's got about 768 lines) but the ones in the DVD players are better as they are the Faroudja chips.
Be aware, there is a problem with Macroblocking on some DVD players. It seems to show up on some LCDs but not on others. Take a look in the DVD Player forum for more on this.
As for DVD Players, look at the Denon 1910 (DVI), 2910 & 3910 (DVI & HDMI), Panasonic S97 (HDMI) and Samsung 945 (HDMI), I think that's the model number but check on the website.
HTH,
Richie.