My most used rails are the 3000 and 1900. I joined rails for way too long before I bit the bullet and got the 3000. The 2700 is the only one I do not own.
The only thing I would say differently is that I didn't put up with it very long.
I got the LR32 version of the 1400, when I bought the saw, added a 1080 very quickly. Not long after that, having joined those two a few times, I jumped straight to the 3000. The "somewhere in between" of 1900 came next. Those 4 served me well for quite a while. I did add a 2424LR32 a year or so ago, because of a specific need. The 800 was actually the last one, and it has proven to be pretty handy too. The 2700 is the only one I don't have, but I have more than plenty of space.
The advantage you do have going for you though is buying it long enough ago to get that price.
To the right buyer, you could probably sell it for a profit...but the 3000 is going to be more costly to cut into that gain.
The TSO extender might be just the solution for a lot of people. The 1400 is barely enough to crosscut 4 x 8 sheets with a TS55 and isn't enough with a TS75. That extension could solve that problem too.