Flippa.com is the biggest place to sell brand name domains. They have a premium domain category where you can set a limit the auction needs to reach in order for the domain to be sold. They are safe and if the buyer ducks out on the payment you wont lose your domain.
I don't think that Flippa goes mad about brandable names.You can try submit them on BrandBucket.com.They are verry strict and will only choose the best names.They will allso set the price for you and make you a professional logo.They also have good prices. If you need anymore advice on where to sell your names, PM me!
Oh....i just saw you need to sell them fast...i don't know.Brandable names don't often sell fast just by listing them.Maybe try eBay for fast selling, but don't expect your desired prices.Cheers!
You can try to sell your sites on Flippa and here on digitalpoint forum! I think there is a 30$ fee for listing it on flippa and I'm not sure are there any fees on digitalpoint. You need to check this! Maybe someone has experience with selling websites, so he or she can leave a comment on this thread!