I had Google Talk, Skype, my country's Gadu-Gadu and later Facebook chat in the same app! The same uniform interface with SMS. I had one simple button to switch protocols. I could also easily see online status of my contact on all of these (and fall back to SMS if they weren't online).
When I showed it to friends at the time they were mostly confused about it, or didnt "get" the value of it.
There is the F(x)tec Pro1X [0] which looks similar to the Nokia N900. It's a little bit too expensive for the specs (about 740€ for the 8GB/256GB version with Snapdragon 662), but could be a nice phone.
Or maybe OnwardMobility will succeed and release the new Blackberry this year and it won't be a piece of crap. /s