Thanks for the kind words, mp46. The possible problem with a '94 and up is I believe the frame is different than the earlier models. I have no way to confirm this at all, and honestly have been curious about this myself. This is what I read once in all my searching for info before I did my conversion. This of course makes a simple swap not as simple. Front cross-member location would be my biggest concern. Mine fits with less than 1" clearance between the cross-member and my oil pan, which hangs down level with the bottom of the cross-member.
I would love to have a new direct-injection engine in a newer S10, believe me. Typical virus that affects us all : the $$$ bug. It seems to eat most of it and leaves us weak. <img src="/forums/images/graemlins/lol.gif" alt="" />
As far as a price to convert, I couldn't really give you any idea. But I can give you some idea what may have to be done:
Motor - one that will actually physically fit in the rig your a-riggin
Transmission - has to be mated to the motor you picked, either with an adaptor plate or bell-housing
Drive shaft - my stock one happened to fit, otherwise a match fit or custom-made one would be required
Rear differential - may have to change this to get the right ratios to match the engine's output to some degree
Wiring - depends on the motor...mine was easy, I imagine newer direct-injected computerized would be considerably more work
Exhaust - have to be sure there is enough room to fit it from the manifold down under the cab
Radiator - I used the stock radiator, not only becasue it fit 100% but it was plenty big enough, though making hoses fit was something else
Intake - make sure it will fit under the hood ok
Misc - speedo has to work off whatever transmission is in there; vacuum pump for power brakes; power steering pump; A/C if you have it; fuel system upgrades, such as diesel fuel filters and water seperator; sensors for stock guages (if you have them/want them functioning); and a decal on your gas cap door in big, bright letters spelling DIESEL so you or someone doesn't put a whole bunch of gas in the tank and end up blowing up the nice, new project. <img src="/forums/images/graemlins/ignore.gif" alt="" />
Oh yea, the gas would have to be pumped out of the fuel tank and lines before the first start-up or that could ruin your engine before you ever get to drive it.
This is why I picked a S10 to convert, as I knew (or luckily guessed) that it should fit pretty much right in place physically, and everything else was easily converted/adapted/modified.

This sounds like a lot, and it is. But it's far from impossible, as some peole have done some pretty amazing conversions. I've read about a guy in another forum whom is goiung to shoe-horn a Cummins diesel from a Dodge into a 4x4 S10. I haven't followed his progress for a long time, so I'm curious to see if he has it in yet. People will try anything.