I'm not sure how ez it is to find these anymore, from what I understand, they quit building the 1.9NA in Jan. 2005. I got a few about 5 yrs ago for $1700 (New 1.9 NA Long Block) The TD's were complete, and $3200
Overland was the distributor, and I have a link to all their dealers, but can't find at the moment. All I've seen lately is the 1.9 TDI which they also offer, but are the newer block (not the 1Z), so mounts are different.
The 1.9 IDI (AAZ) is a 'drop-in', only being 16mm taller than the 1.6. the NA is ~66HP, and the TD ~74 (with the smaller 1.9 turbo) They all have squirters and are TD compatible (at least mine are) I got mine with 1.6 Hyd heads, so the intake manifolds of my 1.6's work. (The 1.9 has oval intake prots, and don't match (without welding and re-porting mainfold, GEX makes modified intakes, but Overland was providing 'adapter' plates on the later conversions.)
I really like the extra torque of the longer stroke, and still have a couple 1.9's that I will stick in a Westy and Samari. I can't seem to get as good economy w/1.9's (~42-44) as my 1.6's (44-48) But they are a good choice for Caddies too. I frequently tow over 1000# and use mine daily as a 'work' truck. (but I use a larger truck to tow my 'bulldozer' :oops: )
You will want a Turbo at your altitude. I keep several extra TD's around for when I move back to Colorado, from WA., but at 1000', I will stick with the NA's for 'longevity'. Tho very spoiled when driving the wife's TDI (B4 Passat @ 52 mpg)