Okay, first things first - this section of the MW forums is for Macross toys, not Gundam toys. Posts regarding those should be posted in the "Anime and Science Fiction" section. I'm sure the mods will move this post and any replies shortly.
Gundam Wing is quite an old series, relatively speaking, so you may find the toys a little hard to find thse days. You should probably look for Bandais line of "Mobile SUIT in Action" toys. These will be a bit smaller than the 1/72 YF-21 and largely made of plastic, but are reasonably detailed and poseable.
AFAIK, there aren't many large-scale Gundam Wing figures. I know there was a big, Japanese-release Gundam Wing Zero, and there may have been a couple of large scale US releases, but I don't recall seeing a large-scale Death Scythe.
Bandai have recently launched a line of "HCMPro" Gundam figures, which are smaller than MSIA figures but very detailed and poseable. Currently, there are no Gundam Wing figures in the line-up but its a possibility for the future. Of course, if you're interested, they would be a good place to discover the many and varied delights of "classic" Gundam, as directed by He Who Kills 'Em All, Yoshiyuki Tomino...