I like some of Butter's work post-Bloomfield and Bishop, but I prefer the traditional Chicago blues stuff over the new horn-driven material.  The guitarist after Bishop was Buzzy Feiten, but he started in 1969; he was blond though and a real kid when he started. 

If you like the big band and big arrangements thing, you should have seen the Electric Flag in their short life.  They were an awfully drugged-up group, but when Bloomfield had them organzied as best they could, they were tight and bluesy and jazzy.

A good album to check out is the Ford Brothers tribute to Butterfield.  That's Robben Ford and his brothers blues band.  They cover a lot of the type of work you like.  They also did a great tribute album to Bloomfield.  I saw them perform this material live three times and it was wonderful -- full horns, backup signers, and guests like Nick Gravenites and Al Cooper.