Alfred kind of bizarrely stops half-way there: you type anything to find the object you want to manipulate, and then... pick a verb by hitting the appropriate command key or arrowing through a list. My hands are already in the middle of the keyboard, just let me type the verb name!
Alfred is really just a launcher with a few nice bonus features (clipboard history & spell are my favourite) where as quicksilver is more like a command line power house.
examples:
open report.pdf - opens in default pdf application
find report.pdf - opens directory in finder
Take a look around in the preferences, while it doesn't have all the features of Quicksiver, you'll be surprised.(Edited formatting)
I don't think I've every come across launch bar but I agree on the price.
1. Turn on fuzzy matching in the preferences under Applications (with or without anchoring, as you prefer)
2. Create a Spotlight Comment if you want to call it something completely different (e.g. label all your browsers with the keyword "browser" to launch them all at once) More on Spotlight comments here: http://help.alfredapp.com/features/applications/