They're all good, but it's been years since I've been to the fox den. And I've never tried the Nguyen's as of yet.
I'd say 6456 probably best value for your money, followed closely by 1122 and WCA. Personally I tend to prefer 1122 and WCA but I've always had fun with 6456 too. I'd say you can't go wrong with either of those 3 agencies. (BTW, 6456 and 1122 only advertise on LL when the girls are working and available. WCA you can book ahead.).
Rouge is fantastic but a bit pricey, and they don't do 1hr appointments. Outlook is similar price to 1122 and WCA but I've only seen one girl there so far so can't really comment much on them overall (but Aisha was a lot of fun).