I've chosen
AMULANCE as my first vinyl based on several factors:
1. We have 4 previously unreleased bonuses to add to the EP, which makes it a nice 44 minutes LP album
2. The band is awesome, easily the best and easiest to work with guys, which are genuinely interested in making a good release and always ready and willing to provide the best liner notes and everything I've asked them for
3. The CD version of the EP sold out in no time and there is still demand for it.
Here's the situation with the one's you are interested in:
ANCIENT CROSS, NITEFALL - atrocious cd sales. I still have more than half the stock of both releases on hands. I love both albums, but until I move the cd stock there is no way to engage in vinyl on those...
MORBID SIN - the sound quality of both "masters" will not warrant good wax result: SOTF master had the high end fried badly, The Demos were lifted off from old crusty cassette tapes... Both artworks are no big enough to be used on LP, nor are any of the archive pictures we've got.
IMPACT - similar to SLANDER, the album is a collection of lo-fi demos. I'm sure it will sell great on wax regardless, just like SLANDER. So it is on the "consideration" list. I just didn't want to start my vinyl adventure with such release.
SENTINEL BEAST, MILITIA - again collections of demos. Both are on the list for consideration, given first vinyl is success and I can recoup funds to carry on.
You should make another survey after this one.

I will, but only once/if AMULANCE wax sells good enough and I can recoup enough funds to keep going.