So what's the bottom line? If you want a couple 1847 "Walkers" and can't afford a pair of "originals" (which few of us could), who makes THE absolute best reproductions that you can get your hands on?
I have the Uberti Walker and can recommend it, although I cannot compare it to others. Fit, finish, and quality are excellent.
Also, two Walkers were produced as part of the Colt Blackpowder Signature Series, often called 3rd Generation blackpowder Colts. One was produced in 1994 and the other in 1997 as an anniversary model. Although these are generally consided Colts, they were actually manufactured and assembled by the Colt Blackpowder Arms Company using mostly Italian parts, under an arrangement with the Colt company. The boxes have the actual Colt logo. I have a couple (not Walkers) and the quality is a notch above common Ubertis. These guns are not difficult to find NIB on the Internet at sites such as GunsAmerica. Expect to pay in the $600-$900 range.
There were also two Walkers produced as 2nd Generation Colts in the early 1980's. One was a "Heritage" model. These are harder to find in good condition, and more expensive.
By the way, an original Colt Walker sold at Julia Auctions in October 2008 for $920,000, the most expensive firearm ever sold at auction.