Catskinner,
I'm like you, seems I always have an idea for something else or something new. I think that's part of the enjoyment and of trying to perfect a setup.
I don't know much about the target cameras. Seems you would need a good battery to operate one all night. The camera would need the ability to see infrared light. If so, you can get IR lights rather cheap and have them burn all night via photo cell, hooked to a trolling motor battery One single light would burn every night for around two weeks (if you have a good battery) before the battery needs a recharge. The small 850nm lights I used to use are cheap, slightly over $10 each on Eaby. They do have a slight red glow to them, but I have used them successfully over the last two seasons.
The bullet camera I am using cost around $105 on Ebay. That's not bad and it's a good camera. It comes with a mount that you can attach it to the side of a building or some platform, even attached to the outside of your house.
Another idea is to install one of those bullet cameras as a stand alone unit, mounted near the window of your house or hunting shed, have it attached to a small LCD monitor like I am currently using, and have that mounted inside, aim the camera at the bait site but keep it turned off until you need it. No need to keep it turned on all night if you aren't viewing it all the time. When you want to see what's out there, you can turn on the camera and monitor with the push of a button if you wire in one of those small remote control devices I use, and then use a separate remote control to turn on your IR light that is mounted near the bait site. OR - I have seen remote control devices in packs of two where both operate on the same frequency, so with one push of a button you could turn on everything at the same time. You should be able to see very well. Then you turn everything off and save battery. You could put that outfit together rather cheaply.
Here's an idea of costs for that:
*Camera with mount: $105
*Monitor: $25 or less
*Cables / connectors: Probably less than $12
*IR light - $12 for one, or use two or three lights if coyote will tolerate them. OR better yet, get one of those large 198 LED 940nm lights like I am currently using for around $100. No visible light at all. Mount it on a post and aim it at the bait site.
*Remote control switches: About $16 each give or take
*Batteries: Many choices there, but two for around $20 each would work well if you only use them when you need them and not burning all night.
I have tried the remote control switches at a 125 yard distance and they work to turn lights on and off. There is one available on Ebay that has an antenna, so it may extend the range a bit. That remote is about $18.
There's all kinds of possibilities for this stuff. Just determine what you want and then go about finding parts that will allow you to do it. I'll be glad to help or offer advice as to what I currently know about this stuff. Keep in mind that I'm still in learning mode, though I do have my bait site working pretty good right now.