The secret to buying BHPs is cash in your hand, educating your self on the different versions & models and pulling the trigger when you find the right guns.
I have purchased 15+ BHPs over the last 10+ years. Not a single one was NIB. The most I paid for one was $1000 for a T series full house custom with S&W revolver sights, beavertail etc.... that APW Cogan worked on.
Most have been purchased used ranging from $400 to $700 depending on what they were. Do not pay for a NIB gun. At $900 they are too much and there are far to many in the used market.
If you are looking for a long term durable shooter get a MKIII because its cast frame will last longer. It will have more modern combat sights, and dovetails, along with a usable ambi safety. Most 1911 shooters find the original BHP safety too small. It is usable but you have to change your technique a bit by using the joint in your thumb not the tip to disengage the safety.
These days the sweet spot for a decent MKIII is $450-$550 and condition will vary but most BHPs that have not been bubba'd will shoot. Some will look better than others. Most people put a premium on the blued MKIIIs over the epoxy but epoxy is more durable.
If you are looking at surplus guns from CDI always look for the best original finish I can find. If I feel the need to refinish a gun I want to be able to pick the finish and who is going to apply it. When I look at the surplus guns you want to look at CDI or Mach I's VG to excellent guns. Bore condition is more important than finish if you are looking for a shooter. Look for guns that have matching frame, slide and barrel. It is not that mix masters will not shoot but they are not as valuable so when comparing apples to apples you want matching pieces. The sweet spot for surplus BHPs from Israel is over IMHO. Most of the higher quality guns are long gone.
I bought this years ago for $450 OTD.
These days you get this for $440. This is still a solid shooter and with a re-blue or spray and bake of your choice and you can have a nice looking gun OTD for $550-$600 and you know exactly what you have vs a refinish done prior to your ownership.
In the end do not over pay! Auction sights, classifieds and even Armslist can be your friend. It also does not hurt to have a good transfer dealer! Happy hunting!