It's too much money for a rod you can't test cast. I will say this however: If you have a nice deep flexing medium action rod such as the BIIT, you can easily overline it with a WF6F line if you encounter an unusually windy day. Many may think it blasphemey, but a softer (overall) rod will handle an upline better than a very fast, stiffer rod with a soft tip. I fish an Orvis full-flexing Far and Fine rod with a WF6F for throwing streamers with no issues out to 70'. You only need to adjust your stroke and slow down. I also find such rods to be better nymphers than the Fast "dry fly" tapered rods. Have you tried to find a 905-4 BIIt on the used market?
US Veteran and concerned citizen