As has been stated several times above, go for it, a second router will always come in handy. OF1400 is a great unit, I have had one for many years, but the OF1010 is way ahead of it in light weight handling. It fits perfectly in a mid-size range, much more powerful than a typical trim router, but not as bulky as a full 1/2" size.
Same as Cheese, I have two of them, usually set for specific tasks. One sometimes floats, even more, since I retired last year.
As onocoffee mentioned, this is a fairly encouraging bunch. Quite a few of us have multiples of several tools. In my former employment, I regularly used more than a handful of routers, 3 different track saws and at least one of every length track, except the longest, which is no longer sold, in NA anyway.
My needs have changed some, but I still keep them all in a ready, set up, state.
MFK700 is a completely different animal. They are fantastic, especially if you do a lot of edge work. You lose the plunge aspect but gain a lot of edge functionality. The offset of the vertical base is far more stable, when cutting edge profiles.
The horizontal base is great for flush cutting applied edges. Edge banding, solid wood shelf edges, etc. are all right in its range. It is limited somewhat as far as bit length, but it's not a big problem.
8mm shanks are considerably stiffer than 1/4. For some jobs, it not a huge thing, but I prefer 8mm whenever I can get them. A few years ago, it was harder to get them in the US, but has gotten better. I do wish we were able to get the much more extensive selection that is available in Europe.
They are a little more expensive than 1/4", but it's a combination of more material and higher end brands.
I use Woodpeckers, Lee Valley, and Bosch mostly. Like I said, the Festool ones are not available here. (a few that fit the MFK700 are, but that's about it)
17 is not outrageous, 17 is not outrageous.....