Ralph,
There's no reason in the world to avoid spraying Future over BMF. I've done it many times with great success - usually the BMF leading edges of airliners wings....I've never had a problem with it.
As for a camera, there are lots of makes that would do just fine......but I think the main things to look for are:
1. A macro function - allows close-ups.
2. Correction for lighting types - such as tungsten lighitng correction. Normal incandescent lighting is a yellow light - and if not corrected for, will give your models a washed out, sickly unrealistic hue that's completely wrong.
3. A high pixel rate........minimum 6 Megapixels would be a good starting place.
There are a bunch of cameras around that will fill those requirements....have a look at the following thread of my Fw190-D9........
http://www.finescale.com/FSM/CS/forums/675552/ShowPost.aspx
I used a Kodak Easyshare camera....fairly inexpensive, 6.3 Megapixels (I think!), used the tungsten lighing correction, macro function, lit the plane from 3 directions (should have used more lights to get rid of some of the shadows) and used a tripod - that's really important, too.
Always use a tripod. No matter how steady you think you are, you'll NEVER he able to hold a camera as still as a tripod can. You'll get better pics.
For a camera that cost only a couple of hundred dollars, my Kodak works pertty well. You don't need to go out and spend $1900 on a camera just to take pics you'll be happy with - if you're a professional photographer, then you'll NEED that camera worth $2k.......but I sure don't.
Good luck!