First, the Vampire. Have you seen the review Kevin at High Tech Redneck did of the Vampire? It's not bad for a Gen 1. I imagine for the money and for short range use, the Vampire would be OK. Not great like Gen 3 etc, etc., but OK and acceptable. The biggest issue I see with it is the 3x magnification. 200 yard shots in the dark will seem pretty far away, so the Vampire may not fill your need for that kind of range.
I recently purchased the Armasight Spark Gen 1 monocular with the advertised Core technology (supposedly the same as the Vampire). It is darn good for a Gen 1, much better than the old dedicated Gen 1 scope I had before. It has exceeded my original expectations. The resolution is every bit as good as a Gen 3 monocular (personal experience), you just need a good illuminator and need to focus it half way or so to give a tight focus in order to get range out to 100 yards. Again, it's not Gen 3 and never will be, but for the money and considering the resolution, it's not bad and will fill the needs of some hunters. I plan to use it for spotting hogs at feeders in or about 100 yards. While I would like a PVS-14 Gen 3, for my intended purpose the Gen 1 Spark will serve me well, and that's the key. Use equipment that will work for YOUR situation.
I read a review someone did on the Core Technology in another forum. His review didn't seem to indicate the technology was anything special. I don't know what Armasight has done one way or the other, but I can say my Gen 1 Spark is a neat little device. It is clear and has good resolution, especially for the money.
Have you considered a Sightmark Photon digital scope for shooting? I have the 6.5x model and like it for the price.
Pertaining to the Pulsar 19A, I know that DoubleUp uses it with very good results. He was shooting with a Photon 4.6x digital scope but has since graduated up to a Pulsar 50 thermal. Maybe he will chime in with some good advice.