Depends...
Registered from expired, fave all-time that I still own: ConduitLoans.com, as conduit loans represents about 20% of all commercial loans. Gotta love some of the regged ccTLDs too like Game.ms.
Registered from scratch (names never previously taken), fave all-time that I still own: EliteDeletes.com...ironic in that it's a fresh reg about good expired domains, but I absolutely loved this name and even though I use NameTrader.com and Doma.in nowadays, I do still brand my expired domains lists as Elite Deletes. Props also to Mexie.com, Supur.com, and some of my .in's like MyName.in and DownloadMusic.in.
Recent fave registered from expireds: HonestHomeLoans.com, have already gotten offers up to $150 since I got it a few weeks ago, but I'm holding onto this one with a kung-fu grip...so many people get suckered into loans they can't afford, and this would make a great brand for a lender who doesn't do that kind of crap (if one exists!)
Recent fave registered from scratch: TouchTops.com, amidst all the Surface name regging, got a lot of Multi-Touch, Touch, and Tabletop names, and this was arguably the best one I got (SurfaceTop.com and SurfacePCs.com were good, but always gotta worry about TM stuff). I figure there's a reasonable chance these types of computers could be called touchtops, in which case I'd be holding the Surface equivalent of Laptops.com or Desktops.com.