As a fellow N810 user, I would have to advise waiting as well. I've followed the N900 threads both here and, for some of them, in Bugzilla. Nokia seems to be working on software fixes for some of the problems mentioned elsewhere in these forums. I am waiting to see if the number of problems dies down after the first major firmware update is pushed. I am also hopeful that it will include at least some feature improvements.

If I had to buy a phone today, I'd get the Droid. Android seems to be more polished than Maemo 5, I see fewer problems in the Droid forums, there are more apps and they are, again, more polished, and I can still get root if I ever wanted to. OTOH, I don't have to buy a phone today so I'm content to sit on the fence (painful as that can be) for a while.