I did something similar for awhile and was collecting bikes and frames simply because I could and because I thought that they were cool. After some time I came to realize a few things:

1. I was spending more money on bikes, parts, accessories, etc. than what I really wanted.
2. Bikes take up a lot more space than other collectible things.
3. While my bikes were all functional, I didn't ride all of them nearly as much as I thought I would and some hardly ever.
4. When I sold a bike I was lucky to break even with my cost but usually took a loss.
5. Many times what I thought was cool, turned out to be not as cool as I first thought.
6. I love my vintage bikes and they ride awesome. However, there have also been several design and technological advances made over the years that make modern bikes superior to vintage bikes in many ways so my modern bikes get more miles than my vintage bikes.

At one point I had over 25 complete bikes and several framesets, which is a miniscule collection compared to some other BF members. For me it became too consuming; too much time, too much money, too much space. A couple of years ago I looked at my collection and I selected 3 vintage bikes that I would keep and decided that the rest had to go and started the process of selling. Since I started selling my stuff I believe that I've collected nearly $6,000 (give or take). I'm not sure what I paid for all of that but I know that it was quite a bit more than $6,000. I still have a few things to unload that might bring in a few hundred dollars but most of it is now gone. There are couple of bikes that, if I found them at the right price, I would buy but other than that, the bike collection is now more appropriate for me.

So my recommendation is to just be careful and choose the bikes that you really want and try not to be too impulsive. I've also found that I get almost as much enjoyment out of seeing the vintage bike pics posted here on BF by other members just as much as owning them myself. I'm not suggesting that you will have the same experience as me. I'm just describing how I came to the point where I am now.

You've listed 7 bikes that interest you. What would it mean for you if you acquired all 7? Do you have room to store them? Would they all get ridden or would they collect dust? What does it mean for you when one of your bikes has not been ridden for 2 years? Just a few things to think about.