Worth is so much in the eye of the beholder.....it's so hard for me to comment on worth.
In the $100-$200, I think the Kikuichi Carbon linked above is a good value. I do think the TKC is a better all around performer though....is it worth $100 more.....I dunno, how much cash you got burning a hole in your pocket!!
I'd think the Fujiwara carbon would be really similar to the Kikuichi Carbon, but I've never seen it:http://www.chefknivestogo.com/fusu.html
A nice wa-suji would be the Konosuke White #2 series, but it's out of stock at the moment:http://www.chefknivestogo.com/kowh2su24.html
Can't really think of or find many $300+ 240mm suji....seems like in that price range you only find 270mm's which are more popular I reckon.
The Fujiwara/Kikuichi carbon's are good suji's
The TKC would be better than both in edge taking and edge retention
The Konosuke white would similar in property to the TKC
The Takeda would be the thinnest, best edge taking, and best edge retention of them all. However, you might be right about it not being a great dedicated slicer....the edge is likely to be kind of delicate....depends on how robust you need.
Worth, that's up to you to decide. I have a 240mm Kikuichi Carbon that I love to death. I use it as my primary slicer in my house. I also have a Butchihiki, but it's reserved for special occasions.
Does the 240mm Kikuichi perform as well as the Butchihiki....hell no, but it cuts great and it costs about 1/6th the price.